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Unacceptable product reprocessing technique in isobutylene production

A qualified product, isobutene technology, applied in the field of isobutene production of unqualified products, can solve the problems of isobutene product quality not meeting the requirements, affecting the economic cost of isobutene plant production, increasing the difficulty of MTBE production, etc., to avoid low-priced sales , Improve the qualified rate of the factory, and the practical effect of the process

Inactive Publication Date: 2013-06-05
YUEYANG XINGCHANG PETRO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic production of high-purity isobutene usually adopts methyl tert-butyl ether (MTBE) catalytic cracking technology. Due to its purity requirement ≥ 99.20 (wt)%, the catalyst is not activated during the start-up process or there are abnormalities in normal production operations. The quality of isobutylene product is not up to the requirement
Often these unqualified products are sent to MTBE plants to produce MTBE or sold as chemicals at low prices, which affects the production economic cost of isobutylene plants. At the same time, because high-concentration isobutene is used as MTBE raw materials, it increases the difficulty of MTBE production

Method used

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  • Unacceptable product reprocessing technique in isobutylene production

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] In the process of the present invention, the unqualified product tank 1 and the isobutylene intermediate storage tank 3 are connected by setting up an unqualified product delivery pipeline and an unqualified product pump 2 .

[0020] Wherein, the unqualified product tank 1 can be used as a spare qualified product tank under normal production conditions, and the unqualified product pump outlet is connected to the qualified product line to go to the qualified finished product tank area 8 .

[0021] The unqualified product is first stored in the unqualified tank 1, and sent to the isobutylene intermediate storage tank 3 through the unqualified product pump 2, mixed with the fresh product 7, and then enters the isobutylene light removal tower 5 through the isobutylene light removal tower feed pump 4, and the reflux is controlled The ratio is 2~4, the operating temperature of the tower is between 69~71°C, and the pressure at the top of the tower is 0.5~0.82 MPa. The materia...

Embodiment 2

[0023] Other conditions are the same as in Example 1, except that the reflux ratio of the light removal tower is controlled to be 2.5 to 3.5, the reflux ratio of the weight removal tower is 1.5 to 2.5, and the purity of the product at the outlet of the overhead distillation reaches more than 99.50 (wt)%.

Embodiment 3

[0025] Other conditions are the same as in Example 2, except that the refined raw materials are all unqualified products, which are not mixed with fresh products, and the purity of the outlet product of the overhead distillation reaches more than 99.20 (wt)%.

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Abstract

The invention relates to an unacceptable product reprocessing technique in isobutylene production. An unacceptable tank, an unacceptable transfer pump and an unacceptable product transfer line are arranged outside an isobutylene light-component removal column and an acceptable product transfer line, and isobutylene reprocessing is carried out in an impurity removal system, wherein one end of the outlet of the unacceptable product transfer line is arranged on an isobutylene intermediate storage tank before the isobutylene light-component removal column, and the other end is connected with the outlet of the unacceptable product pump. The unacceptable product is pumped to the isobutylene intermediate storage tank through the unacceptable tank, and enters the impurity removal system to be reprocessed. The technique can solve the problem of unacceptable products, and ensure the ex factory pass rate of the product to be higher than 99.5%.

Description

technical field [0001] The invention relates to a recycling process for unqualified isobutene products, in particular to an intermediate recycling device and process for unqualified isobutene materials in isobutene production. Background technique [0002] High-purity isobutene is an important organic chemical raw material. It is mainly used to produce methyl methacrylate (MMA), butyl rubber, high-activity and low-activity polyisobutylene, tert-butylphenol, tert-butylamine, and methyl methacrylate. Allyl chloride, trimethylacetic acid, isoprene, p-tert-octylphenol. [0003] At present, the domestic production of high-purity isobutene usually adopts methyl tert-butyl ether (MTBE) catalytic cracking technology. Due to its purity requirement ≥ 99.20 (wt)%, the catalyst is not activated during the start-up process or there are abnormalities in normal production operations. The quality of the isobutylene product is not up to the requirement. Often these unqualified products ar...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C7/04
Inventor 李勇杨海林肖秋云龚琛荥
Owner YUEYANG XINGCHANG PETRO CHEM
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