Clean production process for continuously preparing n-propyl alcohol

Abstract

The invention discloses a clean production process for continuously preparing n-propyl alcohol, belongs to the field of n-propyl alcohol preparation, and particularly relates to a preparation method of a permeable gas-liquid separation composite membrane, which comprises the following steps: adding KH560 and cyclorabamate into a cyclodextrin solution for dispersion, and performing spray drying to obtain a composite microcapsule; adding the modified porous silicon and the composite microcapsule into a PDMS solution, then adding tetraethoxysilane and dibutyltin dilaurate, reacting to obtain a membrane casting solution, coating a bottom membrane with the membrane casting solution, and drying to obtain the permeable gas-liquid separation composite membrane. And the modified porous silicon is modified by KH550 and KH570. According to the invention, modified porous silicon, a composite microcapsule, a cross-linking agent tetraethoxysilane and a catalyst dibutyltin dilaurate are used in a PDMS solution to prepare a membrane casting solution, and a polytetrafluoroethylene base membrane is coated with the membrane casting solution to prepare the permeable gas-liquid separation composite membrane.

Description

technical field [0001] The invention belongs to the field of n-propanol preparation, in particular to a clean production process for continuously preparing n-propanol. Background technique [0002] N-propanol is produced by the hydrogenation of propionaldehyde, which is obtained by the reaction of carbon monoxide and hydrogen by ethylene formylation. The catalyst for the hydrogenation of propionaldehyde can be activated nickel or cobalt catalyst, and the hydrogenation reaction is carried out at a suitable temperature and pressure. The crude propanol product contains a small amount of impurities such as water, n-propyl propionate and di-n-propyl ether , wherein water and n-propyl propionate are the most important impurities affecting product quality, so the purification of the crude n-propanol from the hydrogenation reaction zone is accomplished by rectification, and a small amount of water in the crude n-propanol can be combined with n-propanol and N-propyl propionate forms...

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Problems solved by technology

[0003] In CN101225018A, disclose the removal method of by-product propyl propionate in the process of preparing n-propanol by hydrogenation of propionaldehyde, point out that propyl propionate, water and n-propanol form three-phase azeotrope, and three-phase azeotrope contains approximately 5-45% water, 40-70% n-propanol and 5-25% propyl propionate will cause great waste if they cannot be used; CN101774887A discloses a clean production of n-propanol by hydrogenation of propionaldehyde Process, separation of n-propanol and propyl propionate using pervaporation membrane

[0004] In the prior art, the three-phase azeotrope containing propyl propionate, water and n-propanol in the production method of propanol cannot be recycled and utilized, and it will cause catalyst loss, large heat loss and high energy consumption for solvent recovery during the production process , a series of problems such as poor tail gas treatment effect, the present invention intends to provide a clean production process for the continuous preparation of n-propanol that reduces the above-mentioned various problems

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