chemechemi

 The preparation method of  octyl benzyl phthalate (1) Place the four-necked flask in an oil bath, install a stirrer, thermometer and reflux condenser. Add phthalic anhydride, n-octanol and sulfuric acid to the flask. Gradually heat it to 138-140℃ while stirring continuously, allowing the phthalic anhydride to melt completely into a transparent liquid. Then raise the temperature to 100-110℃ and let the reaction proceed for 2 hours. A monooctyl phthalate is produced.  (2) Cool the reaction product to 60-80℃, drop in sodium hydroxide solution while stirring continuously. Complete the addition within 30 minutes and then adjust the pH of the reaction mixture to 8.0-8.5 using sodium carbonate solution. (3) Heat the reaction product in step (2) to 80-90℃, add catalyst tri-n-butylamine and drop in benzyl chloride while controlling the dripping speed. Complete the addition in 20 minutes. Then raise the temperature to 100-105℃ and conduct a reflux reaction for 2-3 hours.  (4)...

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  Triethyl aluminum (TEAL)is  mainly  used  for organic  synthesis.It  is  an  important  olefin  polymerization  catalyst.  It  can  also  be  used  as  alkylating  agent.It  can  be  used  as  the  co-catalyst  of  Ziegler-Natta  catalyst  compo- nents.It can also  be  used as the fuel of rocket.It  is characterized  by strong  iritation and corrosion.Xiangyang built the triethy aluminum  production  line  in  2010.The  annual  output  of XY-T  triethyl  aluminum  produced  by  the  world-leading  one-step  process  can  be  up  to  7,000 ...

Organic intermediates from "laboratory" to "production line": 3 major core transformation pain points and solutions In the organic chemical industry chain, intermediates serve as the crucial link connecting basic chemical raw materials with end products (such as medicines, pesticides, new materials, etc.). Often, the intermediates that can be stably synthesized and meet the standard purity in the laboratory will frequently encounter problems such as purity fluctuations, soaring costs, and out-of-control safety risks when they enter production lines of tons or even hundreds of tons - this "successful small-scale trial, failed medium-scale trial, and halted large-scale trial" predicament is almost a challenge that all intermediate chemical enterprises will face. This article will focus on the three major core pain points during the transformation from laboratory to production line, analyze the reasons based on actual production scenarios, and provide feasib...