铬酸洗液（Chromic acid lotion）

铬酸洗液（Chromic acid lotion） 铬酸洗液(Chromic acid lotion) Introduction of crude phenol refining Deep processing of coal tar products are oil, crude phenol, refined naphthalene, wash oil, fuel oil, black oil, modified asphalt, etc.. 2 million t/a scale coking plant completed, the annual output of coal tar up to 140704t/a. Coal tar process unit of tank area (including tar dewatering slag, oil preparation, acid base, oil), tar distillation, washing phenol and phenolate decomposition, industrial naphthalene distillation, refined phenol, refined and modified asphalt. 1, production process The tar from the coking plant is sent to the tar depot, where dewatering and deslagging are carried out and then sent to the tar distillation section. Tar distillation adopts atmospheric distillation, and three mixed fractions are cut. Including a dehydration distillation evaporator, the two evaporator cutting temperature asphalt and II anthracene oil, distillate oil, anthracene oil 1 tower isolated and mixed, the obtained mixed fraction is sent to degossypol section. The fraction of phenol removal section used continuous washing process, a mixed first into a continuous washing tower, adding alkaline phenol sodium after washing isolated neutral phenol sodium, and then enter the two times even wash taga alkaline cleaning, separation of alkaline phenol sodium has been washed mixed phenol. Washed mixed phenol is delivered to industrial naphthalene section. The phenol sodium is obtained by phenol salt steaming kettle, and the phenol salt is sent to decomposition. The decomposition of phenol was carried out by continuous CO2 decomposition process. Crude phenol and sodium carbonate were separated in the decomposition column. Industrial naphthalene distillation adopts two furnace atmospheric distillation process of Twin Towers. The fraction of phenol have been washed a section of mixed into the industrial naphthalene distillation column, separated phenol oil after entering the industrial naphthalene rectification tower, separated oil and industrial naphthalene. Batch distillation of phenol was adopted. Raw crude phenol is fed into a dehydrating and dehydrating kettle, where water and residue are removed. Anhydrous crude phenol enters the primary stage and steams out the total fraction in the primary and primary distillation towers. The total fractions were distilled repeatedly in a rectifying kettle and a rectifying tower, respectively, with phenol, cresol and two phr. The distribution box refined crystallization process. The raw material of industrial naphthalene in the crystalline box special for cooling, heating, crystallization and melting procedure, isolated residual oil and refined naphthalene in multiple procedures during the operation. The modified asphalt is prepared by autoclave polymerization process. The temperature asphalt modified asphalt flowing into the reactor, the reactor top oil into the oil cooler cooling oil groove. The modified asphalt enters the modified asphalt tank, and then gets into the modified asphalt forming machine after the cooling of the high pitch trough of the modified asphalt, and gets the modified asphalt product. Phenolic products include phenol, ortho cresol, meta cresol, and two cresol products. Phenol is widely used in industry and is one of the most important basic organic chemical raw materials. With the development of downstream products of phenol, the demand for phenol in recent years is increasing year by year, with tens of thousands of tons of imports each year. China's phenolic resin is the largest application area of phenol, over the years consumption of phenol in more than 40%, mainly for the production of phenolic resins, coatings, adhesives, foam, etc., in 2002 a total of about 80 thousand tons of phenol. In addition, phenol is also used in the production of pesticides, dyes, pharmaceuticals and plastics processing, etc.. O-cresol is the production of herbicides, pesticides, leather tanning agent, disinfectant to Suhl based raw materials, China orthocresol manufacturers mostly due to smaller scale, backward technology, poor product quality, both quantity and quality can not meet the needs of domestic market. Cresol can be used in the manufacture of drugs, disinfectants, plastic additives and spices and so on. The main products of coal tar processing in China are mixed with two cresol and exported to japan. 140 thousand tons / year of coal tar can be obtained phenol products are as follows: Two phenol 488 t Three Ortho cresol 128 t Four Two mixed cresol 773 t Five Two cresol 173 t If finishing, we can also get high purity cresol, cresol, cresol and two cresol isomers, such as 2, 6-, two cresol, 2, 4-, two cresol and other market shortage of pharmaceutical intermediates. Phenol is separated from crude phenol and the main equipments are dehydrating tower and phenol refining tower and corresponding equipments, such as overhead condenser, reboiler and vacuum pump. Our company has a number of coking enterprises design crude phenol separation device, product quality reached the national leader. 1000 tons / year crude phenol separation unit invested about 2 million yuan. In addition, we and Tianjin University are developing a chemical product that primarily addresses the problem of phenolic products changing colors, affecting sales and beauty. Potassium bichromate: water: sulfuric acid =1:2:20 formula, decontamination effect is best. If there is no water, then the lotion is unstable. It will precipitate a large amount of CrO3 red precipitate after being closed for a month. 1. potassium dichromate: need to grind fine. Cause: the powder is more soluble. The operation is in the fume hood, because the potassium bichromate powder raised during the grinding process is harmful to the health. 2. according to MDL CrossFire Commander 7 (Gmlin inorganic compound manual) inquiry: 60 degrees, potassium dichromate in potassium dichromate saturated solution weight percentage is 33. 56%, 60 degrees 100 grams, water can dissolve 50.5 grams of potassium dichromate. 3. dissolve the potassium dichromate with water at 60 degrees first, and then accelerate the preparation of the lotion. Do not cool, stir, direct, a small amount of industrial sulfuric acid (98%), each time the amount of less than 10 ml.. 4. do not use cold water bath. The reaction temperature is controlled at less than 90 degrees. The temperature is too high for water to evaporate. 5. potassium dichromate saturated solution and sulfuric acid have the following reaction: K2Cr2O7+H2SO4=K2SO4+2CrO3 (precipitation) +H20 6., the reaction phenomenon: first into muddy, viscous red liquid, and then become a black red clear solution. 7. potassium dichromate dissolves in water as endothermic reaction. 8 sulfuric acid with industrial grade or chemical pure can, without analysis of pure. As for soaking time have their own hobbies, generally speaking, almost ten minutes to soak. Orange red, generally only add 3 to 4 drops of ferroin is not orange red, with yellow, COD slightly higher with green, dichromate was orange yellow trivalent chromium ions is green, determination of COD is dichromate is reduced to trivalent chromium ions, the residual dichromate the yellow, residual dichromate less and trivalent chromium ions were the main green, it is not difficult to understand? Yellow, well understood, not to mention Blue green, Never mind here with the color of ferrous ion, because at this time not to the end point of titration, ferrous ion is not excessive, but the reduction of the residual ferrous dichromate into trivalent chromium ions (green) and ferric ion (brown), green and brown and blue green mixed here Reddish brown, partly in the color of ferric ion, and more importantly, to the end of the titration, a slightly excessive amount of ferrous ion and the color of the complex formed by phenanthroline. The main component of the iron spirit is Phenanthroline The "Yellow Emperor" is one of the traditional Chinese medicine four classics (the "Yellow Emperor", "Treatise on Febrile Diseases", "Golden Chamber", "Wen Bing Tiao Bian"), and it is also the first Chinese ancestors dubbed the "Yellow Emperor" in the name of the masterpiece, is a medical treasure house in our country existing. The first medical books. Is the study of human physiological and pathology, diagnosis, treatment principles and pharmacological medical masterpiece. Established in theory of Chinese medicine "Yin Yang five elements theory" and "pulse theory" "theory of viscera", "Meridian", "etiology" and "pathogenesis theory", "disease" and "diagnosis", and "the treatment regimen", "luck" theory. Its medical theory was founded on the basis of ancient philosophy in China, reflecting the dialectical thought of simple materialism in ancient china. Huangdi Neijing was compiled in the Warring States period, and it is the earliest monograph on TCM theory in china. The spring and Autumn period to the Warring States period summary of medical experience and academic theory, and absorbed the Qin and Han Dynasties about astronomy, astronomy and mathematics, biology, geography, anthropology, psychology, the use of simple materialism and dialectics thoughts on human anatomy, physiology, pathology, diagnosis, treatment and prevention of diseases, to do a more comprehensive this medicine has established a unique theoretical system, has become China medicine development the theoretical foundation and source. This morning, the Beijing Traffic Commission and the Beijing Railway Administration will hold the opening ceremony at Beijing North Railway Station. 11 points, 08 points, train number of Y563 EMU will be the first departure, one stop to Yanqing, no parking on the way. Since then, the Beijing North Railway Station will be issued 9 consecutive EMU, the train minimum departure interval of 34 minutes, the maximum interval of 1 hours and 33 minutes. From tomorrow on, Beijing North Railway Station S2 line will operate according to the normal timetable. It is understood that the S2 line all trains for EMU, to Beijing North Railway Station as a starting point, midway through the Tsinghua Yuan, Qinghe, Shahe, Changping and Badaling, the terminal for the YanQing Railway Station. The plains are 120 kilometers per hour, and 45 kilometers behind the hills. The opening of the line will make it possible for the Olympic tourists to visit the Badaling Great Wall. "The first and last time The first bus Y561 times: departure 6 points 08 points, 7 points to 07 points to Badaling, 7:27 arrived at the end point of YanQing Railway Station. The last bus Y591 time: 21:27, non-stop, 22:41 to Yanqing. 6 pm to 8 pm, Yanqing hauadao xbz (not included) along the Badaling road to Cigou intersection (not included) two-way road, prohibit social vehicles. The direction of Beijing vehicles can bypass Road 110 or from xibozi island around the Badaling expressway; Beijing direction of vehicles from the Juyongguan bypass Badaling expressway. (two) the village of Zheng, Changping: 8:10 to 9:50, seven North Road intersection to Huang Xin Fang Sheng building materials market, Zhenggezhuang village Avenue South to Tivoli center square, the Hot Spring Leisure City gate to Watertown area route longevity Pavilion, water space road by Fu Shou ting to the parking lot East, east to East Gate Plaza cultural center, Zhenggezhuang village Shangcheng Road, two-way forbidden society vehicles and pedestrians. (three) China Film and television base in Huairou district: 9:40 to 11, the Beijing Chengde expressway toll station to Yanlu Yang Song Yang Yang Gang, Yang Songxi somsi lamp lights by Huai Yang Lu Gang to 101 Huairou overpass, two-way social motor vehicles prohibited. (four) Miyun: 10:50 to 12:15, Miyun Reservoir by the reservoir dam, head to the East, the dam dam to head south, the road on the east side of the reservoir dam to the south gate, two-way social vehicles prohibited. Traffic control measures will be adopted in accordance with the torch relay situation in the closed road and Ring South road. (five) Pinggu district: 13:30 to 15, Chollima (Forum Gallery) around the island (not including) the Palace Street to customs intersection (not included), two-way social vehicles prohibited. (six) Shunyi District: 14:55 to 16:20, Shuanghe street, Henan village, South lights Gang, through Shuanghe street to Xiangyang junction (excluding), two-way ban on social vehicles. 15:10 to 16:50, Xiangyang junction through the way to Yanjing bridge (excluding), two-way ban on social vehicles. (seven) Tongzhou District: 15 to 17:30, Jade East Street intersection (not included) by the riverside road to the North Bridge intersection (not included), two-way social vehicles prohibited. 15 to 17:30, Xinhua West Street East (excluding) the Xinhua Xinhua Street to Street East (including), Xinhua Street East (inclusive) through the streets to Hu Furong Road intersection (not included), two-way social vehicles prohibited. August 8th (I) Fangshan District: August 7th, 8 to August 8th, the end of the event, the Zhoukoudian Ape Man Site Park prohibit the passage of social vehicles. 6 to 9 o'clock, Jing Zhou road, Zhoukoudian junction to the site of the site of the ape man, two-way ban on social vehicles. 6 pm to 9 pm, Zhou Sheng Lu man site before the door to Teplice wallpaper factory road, two-way prohibit social vehicles; Zhou Sheng Road intersection to victory Teplice wallpaper factory road bridge, prohibit social vehicles from north to South direction. (two) Mentougou district: 7 to 9:25, Mentougou Lu Feng Cunqiao stone bear lamp control port (including) from Tam Road to the double valley around the island, two-way social vehicles prohibited. 7 to 9:25, Shijingshan District Ma Valley junction to double valley around the island, from east to west to prohibit the passage of social vehicles. (three) Daxing District: 8:55 to 10:40, Xinghua Road by Venus Road to the Industrial Avenue, Industrial Avenue through Industrial Avenue to Qingyuan Road, two-way social vehicles prohibited. (four) Yizhuang development zone: 10:10 to 11:40, the cultural park road network, North East, east side car road, Yongchang Road, east section ring road, Wanyuan street, Longqing street, and two-way street, prohibit social vehicles. (five) Haidian District: 11:30 to 12:15, Haidian bridge (excluding), through the road and Yee Road to Beijing (search) 101 high school, two-way ban on social vehicles. Via the above sections of the vehicles can bypass road, North Street Zhongguancun wanquan. 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The spring and Autumn period to the Warring States period summary of medical experience and academic theory, and absorbed the Qin and Han Dynasties about astronomy, astronomy and mathematics, biology, geography, anthropology, psychology, the use of simple materialism and dialectics thoughts on human anatomy, physiology, pathology, diagnosis, treatment and prevention of diseases, to do a more comprehensive this medicine has established a unique theoretical system, has become China medicine development the theoretical foundation and source.