C4 mixture hydrating process of preparing butyl alcohol

Abstract

The present invention is the process of hydrating C4 fraction in the presence of catalyst with molecular sieve or modified molecular sieve as active component. The reaction is high pressure liquid phase fixed bed process; the material is C4 fraction produced in the petroleum processing process, MTBE processed mixed C4 fraction or some single C4 olefin; and the catalyst has acid molecular sieve or metal salt or oxide modified molecular sieve as active component. The solid acid catalyst with molecular sieve as active component has better catalytic activity and selectivity to the hydration of C4 olefin in corresponding conditions, the material needs no concentration and the catalyst may be regenerated.

Description

technical field

[0001] The invention relates to a method for preparing butanol by hydration under the action of a molecular sieve catalyst starting from mixed C4 fractions. Background technique

[0002] C4 fraction is a by-product of petroleum processing, and there are many methods for its deep processing and utilization. One of the deep processing methods is to convert the olefin components into alcohols through hydration. The catalyst used for hydration was liquid acid the earliest, such as using 40-50wt% sulfuric acid aqueous solution as catalyst in JP23524 / 72, and iron sulfate or antimony chloride aqueous solution can also be used as catalyst (JP7125 / 74). The use of inorganic acid solution as a catalyst has many disadvantages. When the acid concentration is reduced to reduce the corrosion of equipment, the reaction activity is also reduced; when high concentration acid is used, not only the equipment is severely corroded, but also side reactions such as olefin polymeriza...