The Process Optimization On Propenol Production Unit Of Epichlorohydrin Device

Epichlorohydrin(ECH) is an important organic chemical raw material,which iswidely used in production of epoxide resin and chlorohydrine rubber.The companyhas two sets of ECH.Both adopt allyl acetate production process.Product qualityimplements Standard GB/T13097-2007.The1st set was introduced fromShowaDenkoKK,Japan in1966.On the basis of digestion and absorption of the1stset, we designed the2nd set by ourselves,which was built completely and put intoproduction in2007.At that time,the company became the largest company thatadopted allyl acetate process to produce ECH in China and even all over the world.The process allyl acetate production process includes two independentproduction units, propenol production unit and ECH production unit. In propenolunit Pd/SiO2is used as catalyst. Acetylation reaction of propylene,oxygen and aceticacid take place in a fixed bed reactor,forming allyl acetate. Then allyl acetate goesthrough hydrolysis and purification procedure and so on.70wt%propylene glycolaqueous solution is gotten.In ECH unit70wt%propylene glycol aqueous solution isused as raw material,after chlorination, saponification and purification procedure andso on,ECH is gotten.This paper fully introduces the major performance and processing applicationof ECH and propenol;summarizes the major production process,principle,the state ofdevelopment and prospect of ECH in the domestic and overseas;introduces theprocess flow of propenol production unit,the problems encountered in the actualproduction,and gives the research direction.In order to ensure the long-cycle stableoperation of the plant,Trough the reconstructed and optimized the process and solvedthe bottleneck problems that plagued us for a long time; analysed Characterizationdata and located the reason of catalyst deactivation.We established processreconstruction and optimization countermeasures aiming at the reason of catalystdeactivation.The production and analysis data showed the effect of processreconstruction and optimization was positive.The probability of oxidation catalystpoisoning and deactivation was reduced.The age of catalyst and production increasedobviously. In order to solve the insufficient capacity problem of de-heavycomponents unit,to optimize operating conditions and to reduce the maintenancecost and raw material consumption, we executed the transformation of de-heavycomponents unit.After the transformation,we did the simulate calculation to the de-heavy components column by means of ASPEN PLUS and analyzed theinfluence of the feed location,reflux ratio,operation pressure and withdrawal amountto the separating effect of the column.These provided important secundum for theoperation and optimization of the column in the future.At the end,the innovativepoints are summarized and the future research direction is decided.Througn the implementation of the project, the production process of propenolunit was optimized, the age of catalyst was prolonged,the removal efficiency andmaneuverability of the de-heavy components unit were improved,the level oflong-cycle stable operation of the plant was raised,and much contribution was madeto create benefits to our company.