Production system and method of sec-butyl acetate

A sec-butyl acetate and production method technology, applied in the field of sec-butyl acetate production system, can solve the problems of incomplete butene conversion, low butene conversion rate, high difficulty in utilization, etc., and achieve easy realization and selectivity High, the effect of simplifying the separation process

Pending Publication Date: 2022-03-22
王义成
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation of sec-butyl acetate in the prior art uses a single resin catalyst, which leads to a low conversion rate of butene, poor selectivity, and the inability to completely convert butene, resulting in the difficulty of subsequent utilization.

Method used

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  • Production system and method of sec-butyl acetate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A production system of sec-butyl acetate, such as figure 1 As shown, it includes: the first fixed bed reactor 2, the second fixed bed reactor 3 and the catalytic rectification tower 6 connected in series in sequence;

[0034] Wherein, the catalytic rectification column comprises an acetic acid supplement port 5, a top discharge port 7 and a column bottom discharge port 8, and the acetic acid supplement port 5 is located at the top of the catalytic distillation column 6.

[0035] The catalytic rectification column sequentially includes a rectifying section, a reaction section and a stripping section from the bottom of the column to the top of the column;

[0036] in,

[0037] There are 20-30 theoretical plates in the rectification section, 8-12 theoretical plates in the reaction section, and 10-20 theoretical plates in the stripping section.

[0038] A production method of sec-butyl acetate, utilizing the above-mentioned production system of sec-butyl acetate to react,...

Embodiment 2

[0044] A kind of production method of sec-butyl acetate, different from embodiment 1 is:

[0045]In step (1), the DB757 high temperature resistant resin catalyst is loaded in the first fixed bed reactor, the reaction temperature is set to 100°C, the pressure is 2.0Mpa, and the space velocity is 2h -1 ;

[0046] In step (2), the second fixed bed reactor is filled with D005 and D006, wherein the reaction temperature is 80°C, the pressure is 1.0-2.0Mpa, and the space velocity is 1-4h -1 ;

[0047] In the step (3), the reaction section of the catalytic rectification tower is set to have a tower top temperature of 60°C, a reaction section temperature of 90°C, a tower still temperature of 182°C, a pressure of 0.6Mpa, and a reflux ratio of 3.0.

[0048] The final total butene conversion was 92.53%, and the sec-butene acetate selectivity was 97.19%.

Embodiment 3

[0050] A kind of production method of sec-butyl acetate, different from embodiment 1 is:

[0051] In step (1), the first fixed bed reactor is filled with DA330 high temperature resistant resin catalyst, the reaction temperature is set to 90°C, the pressure is 1.2Mpa, and the space velocity is 3h -1 ;

[0052] In step (2), the reaction temperature in the second fixed bed reactor is 75°C, the pressure is 1.0-2.0Mpa, and the space velocity is 1-4h -1 ;

[0053] In step (3), the reaction section of the catalytic rectification tower is filled with CDM module catalyst, and the temperature at the top of the column is set to be 50°C, the temperature of the reaction section is 80°C, the temperature of the tower still is 175°C, the pressure is 0.5Mpa, and the reflux ratio is 2.0.

[0054] The final total butene conversion was 94.19%, and the sec-butene acetate selectivity was 98.55%.

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Abstract

The invention discloses a sec-butyl acetate production system and method, and belongs to the technical field of sec-butyl acetate preparation, the sec-butyl acetate production system comprises a first fixed bed reactor, a second fixed bed reactor and a catalytic rectifying tower which are sequentially connected in series; wherein the catalytic rectifying tower comprises an acetic acid supplementing port, a tower top discharge port and a tower bottom discharge port, and the acetic acid supplementing port is located at the tower top of the catalytic rectifying tower. The problems of low butene conversion rate and poor selectivity in the prior art are solved by mainly utilizing a grading scheme of a fixed bed catalyst and a combined mode and process of a catalytic distillation reaction section. In addition, the invention also has the advantages of convenient and flexible loading and unloading, stable operation, small catalyst wear, easy industrial application, easy control of catalyst dosage according to different catalytic rectification processes, and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of sec-butyl acetate, in particular to a production system and method of sec-butyl acetate. Background technique [0002] With the increasing utilization of butene in C4, the technology of producing sec-butyl acetate by butene addition method is also becoming more and more mature, and the technology of producing sec-butyl acetate with butene and acetic acid has better economic performance. The esterification reaction is carried out in a suspension stirred tank under the catalytic action of a cationic sulfonic acid type ion exchange resin, and the esterification yield is 50%-80%. The esterification method in Japan also adopts cation exchange resin, and the reactor is a fixed-bed tubular reactor, and the selectivity of producing sec-butyl acetate can reach 89.5%-96.6%. Soviet scientists also studied the reaction between n-butene and acetic acid esterification, and also used cation exchange resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/04C07C69/14
CPCC07C67/04C07C69/14Y02P20/10
Inventor 王义成
Owner 王义成
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