Method for preparing n-butene

A technology of n-butene and sec-butyl acid, applied in the field of preparing n-butene, can solve the problems of high cost, low yield, complicated process and the like, and achieve the effect of avoiding material loss

Active Publication Date: 2015-12-16
ZHUHAI FEIYANG NOVEL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems of complex or low yield and high cost in the existing industrialized production of n-butene, and provides a method for preparing n-butene from monobasic organic acid sec-butyl ester

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This example provides a method for preparing n-butene, using sec-butyl formate as a raw material, and performing cracking reaction in a tubular reactor.

[0020] The tube-and-tube reactor used is three reactors in series. The internal tube is a 2.5-meter-long DN50 stainless steel tube made of 316L. The outside of the tube is a jacket. The jacket is heated by steam to provide a heat source for the reaction system. The height of the reactor is 12000mm and the diameter is 150mm.

[0021] Fill the strongly acidic cation exchange resin into the tube-and-tube reactor and reserve space for thermal expansion. After filling the catalyst, fix the tube-and-tube reactor. spare.

[0022] The strongly acidic cation exchange resin used is D-005 type cation exchange resin produced by Dandong Mingzhu Special Resin Co., Ltd.

[0023] Continuously feed nitrogen into the tube-and-tube reactor for 30 minutes, and replace the air in the tube-and-tube reactor with nitrogen. Then, the sec-b...

Embodiment 2

[0027] This example provides a method for preparing n-butene, using sec-butyl acetate as a raw material, and performing a cracking reaction in a tubular reactor. The reaction conditions are the same as in Example 1.

[0028] The cracking conversion rate of sec-butyl acetate is 95%.

Embodiment 3

[0030] This example provides a method for preparing n-butene, using sec-butyl propionate as a raw material, and performing cracking reaction in a tubular reactor. The reaction conditions are the same as in Example 1.

[0031] The cracking conversion rate of sec-butyl acetate was 86%.

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Abstract

The invention relates to the technical field of organic synthesis, particularly a method for preparing n-butene. The method comprises: by using process parameters disclosed by the invention, splitting monoprotic organic acid butanol acetate to prepare n-butene; splitting the monoprotic organic acid butanol acetate with high selectivity to monoacid and n-butene; discharging a part of monoprotic organic acid and unsplit raw materials from the bottom of a reactor; and discharging n-butene and the other part of monoprotic organic acid from the tower top and feeding the mixture to a rectifying tower so as to separate high purity n-butene. By using monoprotic organic acid butanol acetate as the raw material and matching a proper catalyst, splitting reaction at certain temperature, pressure and air speed is carried out to obtain organic acid and n-butene, wherein the obtained split product is rectified to prepare high purity n-butene. The conversion rate of monoprotic organic acid butanol acetate can reach up to 95%. Unreacted raw materials can be recycled, so that the material loss can be avoided.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a method for preparing n-butene. Background technique [0002] The molecular formula of n-butene is C 4 h 8 , the structural formula is CH 3 CH 2 CH=CH 2 , a colorless gas at normal temperature and pressure, is one of the important basic chemical raw materials. N-butene is mainly used in the manufacture of butadiene, followed by the manufacture of methyl ethyl ketone, sec-butanol, butylene oxide and butene polymers and copolymers. [0003] There are two main industrial production methods of n-butene: one is obtained by separation of C4 fractions, and the content (quality) of butene in C4 fractions from different sources is different. The C4 fraction obtained from catalytic cracking contains about 13% of 1-butene, 12% of cis-2-butene, and 13% of trans-2-butene; the C4 fraction obtained from cracking contains about 14% of 1-butene, cis-2 -butene 5%, trans-2-butene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/213C07C11/08C07C2/30C07C11/02C08F110/08
Inventor 邱小勇彭威何国殿蓝俊杰蒋兵彭琦吴超
Owner ZHUHAI FEIYANG NOVEL MATERIALS
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