Production process for preparing sec-butyl alcohol by mixed C4 reaction distillation method

Abstract

The invention provides a production process for preparing sec-butyl alcohol by a mixed C4 reactive distillation method. The production process comprises the following steps: the raw material C4 is sent to a tubular reactive rectification tower; vaporized C4 and 75%-85% of sulfuric acid countercurrent flow are subject to an absorption and esterification reaction by a packing layer at the temperature of 25-50 DEG C and the pressure of 0.3-0.8MPa; heat of reaction is removed by cooling water among tubes to keep the reaction temperature; reaction tail gas is cooled, liquified and sent out, and esterified liquid at the tower bottom is pre-hydrolyzed by a static mixer to enter a hydrolysis tower; and dilute sulfuric acid at the tower bottom is stripped and hydrolyzed by steam at the tower bottom, concentrated to 75%-85% by virtue of a sulfuric acid concentration process and then is returned to the tubular reactive rectification tower, an azeotrope of the sec-butyl alcohol and water is separated out a sec-butyl alcohol light ends component tower and a sec-butyl alcohol heavy ends component tower to obtain the sec-butyl alcohol product.

Description

1. Technical field [0001] The production process for preparing sec-butanol by mixed C4 reactive distillation method provided by the present invention belongs to the field of petrochemical industry. 2. Background technology [0002] At present, after the liquefied gas in refining and chemical enterprises passes through MTBE and gas separation equipment, propylene and isobutene are separated and utilized. There is no better way to utilize propane and the remaining mixed carbon dioxide, so it has to be used as civil fuel. The remaining mixed carbon four, which contains more than 50% n-butene, is an effective resource for the production of sec-butanol and methyl ethyl ketone. [0003] The process of producing sec-butanol from n-butene mainly includes direct method and indirect method. [0004] The existing indirect hydration method is that sulfuric acid absorbs n-butene in the reactor, generates butyl sulfate and then hydrolyzes it to produce sec-butanol. The molar ratio of sul...

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Problems solved by technology

The two processes have the advantages of not consuming a large amount of sulfuric acid and caustic soda, light equipment corrosion, no waste water discharge, high selectivity of sec-butanol, etc., but there are also strict requirements for n-butene content (>90%), and the mixed carbon four needs to be re- Build a set of extraction, separation and concentration equipment, which has disadvantages such as low conversion rate per pass, high cycle energy consumption, high energy consumption for sec-butanol separation in water, harsh reaction conditions, and acid-resistant materials for equipment.

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