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Preparing method of isobutene using tert-butyl alcohol

A technology for tert-butanol and isobutene, which is applied in the field of high-purity isobutene by dehydration of tert-butanol, can solve the problems of high energy consumption and high equipment investment, and achieves the effects of less equipment investment, easy operation and convenient filling.

Active Publication Date: 2011-04-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these methods focus on the separation of isobutene products, which are separated by one or two rectification towers to obtain isobutene products, but both use two rectification towers to realize the recovery of tert-butanol azeotropic mixture, and by-product carbon eight and water Separation, equipment investment is large, energy consumption is large

Method used

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  • Preparing method of isobutene using tert-butyl alcohol
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The tert-butanol raw material 1 with a near-azeotropic composition enters the fixed-bed reactor a, the reaction temperature is 85°C, and the reaction pressure is 1 MPa. The reaction product 3 enters the rectification tower b. The rectification tower b has 16 theoretical plates in total. 12 theoretical plates, the operating pressure is 0.12MPa, the temperature of the top subcondenser c is 5°C, and the isobutene product 5 is extracted from the vapor phase, which is condensed into a liquid product 7 after being cooled by the condenser d; the liquid condensed by the subcondenser The phase is mainly refluxed, a small amount of liquid phase material 6 is extracted, the side stream material 4 is collected from the third theoretical plate, mixed with the raw material 1, and then enters the reactor a, and the stream 8 is extracted from the tower kettle. The specific logistics flow and composition are shown in Table 1.

[0016] Table 1

[0017]

Embodiment 2

[0019] The tert-butanol raw material 1 with a near-azeotropic composition enters the fixed-bed reactor a, the reaction temperature is 60°C, and the reaction pressure is 1.5 MPa. The reaction product 3 enters the rectification column b, and the feeding position is the 30th theoretical plate. A theoretical plate, the operating pressure is 0.3MPa, the temperature of the top separator c is 29°C, and the isobutene product 5 is extracted from the vapor phase, which is condensed into a liquid product 7 after deep cooling by the condenser d; the liquid phase condensed by the separator Mainly reflux, a small amount of liquid phase material 6 is extracted, side stream material 4 is collected from the sixth theoretical plate, mixed with raw material 1, enters reactor a, and stream 8 is extracted from the tower kettle. The specific logistics flow and composition are shown in Table 2.

[0020] Table 2

[0021]

Embodiment 3

[0023] The tert-butanol raw material 1 with a near-azeotropic composition enters the fixed-bed reactor a, the reaction temperature is 95°C, and the reaction pressure is 0.5 MPa. The reaction product 3 enters the rectification tower b, and the feeding position is the 15th theoretical plate. There are 30 rectification towers in total. a theoretical plate, the operating pressure is 0.08MPa, the temperature of the top separator c is -5°C, and the isobutene product 5 is extracted from the vapor phase, which is condensed into a liquid product 7 after deep cooling by the condenser d; the liquid condensed by the separator The phase is mainly refluxed, a small amount of liquid phase material 6 is extracted, the side stream material 4 is collected from the third theoretical plate, mixed with the raw material 1, and then enters the reactor a, and the stream 8 is extracted from the tower kettle. The specific logistics flow and composition are shown in Table 3.

[0024] table 3

[0025] ...

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Abstract

A preparing method of isobutene using tert-butyl alcohol is characterized in that a fixed bed is applied as a rector for the dehydration of tert-butyl alcohol, reaction products are separated in a rectifying tower, the condenser in the tower top is a partial condenser, liquid phase is almost in infinite reflux state, only a few is collected to prevent enrichment of 8 carbon byproduct in the tower, steam phase isobutene is collected and transformed into liquid phase isobutene product after being deeply cooled in the condenser, another product water is collected from the tower bottom, and the mixture of tert-butyl alcohol and water close to azeotropic composition is collected from the lateral line to return to the fixed bed reactor. The reactor and the rectifying tower in the invention combine as a system, wherein complete reaction of tert-butyl alcohol and separation of products can be achieved through adjusting operations of rectifying tower. Water is collected from column bottom, andhigh purity isobutene is collected from tower top. The method is characterized by low investment of equipment, convenient filling of catalyst and easy operation.

Description

technical field [0001] The invention relates to a process for preparing high-purity isobutene by dehydrating tert-butanol. Background technique [0002] Isobutene is an important basic organic chemical raw material. High-purity isobutylene is mainly used to prepare various organic chemical raw materials and fine chemicals such as butyl rubber, polyisobutylene and methacrylate. So far, there are three main production methods of high-purity isobutene: adsorption separation method, methyl tert-butyl ether (MTBE) cracking method and tert-butanol dehydration method. Adsorption separation is a technology to produce isobutene by utilizing the difference in the adsorption capacity of n-butene and isobutene on molecular sieves. This method is suitable for the production of high-purity n-butene and also for the production of high-purity isobutene, but because the process of this method is relatively complicated, the technical economy of producing high-purity isobutene is not as good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C1/24C07C7/04C07C7/09
Inventor 周金波董炳利王艳飞程中克苟文甲曹凤霞张志喜倪岩施红程亮亮樊英杰杨利斌任海鸥刘飞张松显
Owner PETROCHINA CO LTD
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