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A new process for preparing high-purity isobutene from tert-butanol

A technology of pure isobutene and tert-butanol, which is applied in the chemical industry, can solve the problems of catalyst particles not being fully utilized, catalyst installation and replacement being inconvenient, etc., and achieve the effect of reducing energy consumption and saving investment

Active Publication Date: 2016-02-10
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This filling method has the advantages of small gas-liquid phase resistance and the catalyst is not easy to leak, but it is inconvenient to install and replace the catalyst during use. At the same time, due to the mass transfer resistance inside and outside the catalyst mesh bag, the catalyst particles inside the catalytic rectification element cannot be fully utilized.

Method used

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  • A new process for preparing high-purity isobutene from tert-butanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Vaporization and stripping tower 1 has a theoretical plate number of 25 and an operating pressure of 0.5Mpa (G). The raw material tert-butanol is 3000kg / h, of which tert-butanol is 2400kg / h, water is 600kg / h, and the content of tert-butanol is 80% (Wt).

[0029] The raw material tert-butanol is fed from the top of vaporization stripping tower 1. tert-butanol 240kg / h, water 1183.8kg / h in the mixed solution of the isobutene rectification tower and bottom, the feeding position is the 15th theoretical tray from the first bottom of the vaporization stripping tower, and the steam 7 from the top of the tower is sent to the dehydration In the reaction system, tert-butanol is 2639.8kg / h, water is 293.3kg / h, and tert-butanol content is 89.98% (Wt). The content of tert-butanol in the water discharged from the tower kettle is 0.01% (Wt).

[0030] The isobutene rectification tower is a plate tower with an operating pressure of 0.45Mpa(G), 28 theoretical plates, 240kg / h of tert-but...

Embodiment 2

[0032] Vaporization and stripping tower 1 has a theoretical plate number of 20 and an operating pressure of 0.5Mpa (G). The raw material tert-butanol is 2000kg / h, of which tert-butanol is 1900kg / h, water is 100kg / h, and the content of tert-butanol is 95% (Wt).

[0033] The raw material tert-butanol is fed from the top of vaporization stripping tower 1. 152kg / h of tert-butanol and 525.2kg / h of water in the mixed solution of the isobutene rectification tower and bottom, the feeding position is the 10th theoretical plate from the first bottom of the vaporization stripping tower, and the steam 7 from the top of the tower is sent to dehydration In the reaction system, tert-butanol is 1853kg / h, water is 18.7kg / h, and tert-butanol content is 99.0% (Wt). The content of tert-butanol in the water discharged from the tower kettle is 0.008% (Wt).

[0034]The isobutene rectification tower is a plate tower with an operating pressure of 0.45Mpa(G), 15 theoretical plates, 152kg / h of tert-bu...

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Abstract

The invention belongs to the field of chemical industry, and relates to a method for preparing isobutene, a basic chemical organic raw material, in particular to a new process for preparing high-purity isobutene from tert-butanol. This process is used in various production devices of tert-butanol gas-phase catalytic generation of isobutene. It is characterized by the unique process and structure of vaporization and stripping. It can choose industrial tert-butanol with low content as raw material, and ingenious combination with isobutene rectification tower. The purpose of tert-butanol and separation process wastewater; another feature of the present invention is that the crude isobutene product directly enters the rectification tower for purification without condensation, and this process can further save energy on the basis of the above-mentioned vaporization and stripping process.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a method for preparing isobutene, a basic chemical organic raw material, in particular to a new process for preparing high-purity isobutene from tert-butanol. Background technique [0002] At present, there are three main methods for industrially producing isobutene: the first is from C 4 Sulfuric acid absorption method is used in the distillate; the second is the dehydration production of tert-butanol under the catalysis of activated alumina, sulfonic acid, ion exchange resin, etc.; the third is the separation of C by physical adsorption 4 fraction. [0003] There are two main methods for preparing high-purity isobutene: methyl tert-butyl ether (MTBE) cracking method and tert-butanol dehydration method. The MTBE cracking method is a process commonly used in countries around the world after the 1980s. The product has high purity, and the device scale is flexible. It can produce M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/09C07C1/24
CPCY02P20/10
Inventor 朱小学刘芃叶秋云郑敏王华李南锌
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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