Comprehensive use method of mixed C-4

A technology of mixing carbon 4 and mixture, which is applied in the field of comprehensive utilization of mixed carbon 4, can solve the problem of low comprehensive utilization rate of mixed carbon 4, and achieve the effect of increasing value and good technical effect.

Active Publication Date: 2009-10-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the low comprehensive utilization rate of the by-product mixed carbon four of the steam cracking unit and the low comprehensive utilization rate of the by-product mixed carbon four of the FCC device in the prior art, and a new method for comprehensive utilization of mixed carbon four is provided

Method used

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  • Comprehensive use method of mixed C-4
  • Comprehensive use method of mixed C-4
  • Comprehensive use method of mixed C-4

Examples

Experimental program
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Effect test

Embodiment 1

[0027] according tofigure 1 As shown, the mixed C4 composition (% by weight) is: butadiene: 40.0%, isobutene: 12.0%, butene-1: 18.0%, butene-2: 18.2%, butane: 11.8%. According to the technical process of the present invention, acetonitrile is used as the extraction agent 2; as described in the background art, the extraction and extraction of butadiene unit includes an extraction column, a water washing column, a rectification column (2) and a rectification column (3). The extraction tower is a valve tower with 60 plates and the operating pressure at the top of the tower is 0.45MPa; the washing tower is a valve tower with 50 plates and the operating pressure at the top of the tower is 0.6MPa; the rectification tower (2) is a float The valve column has 40 plates and the operating pressure at the top of the column is 0.5MPa; the rectification column (3) is a valve column with 60 plates and the operating pressure at the top of the column is 0.8MPa. The etherification unit includes...

Embodiment 2

[0029] according to figure 1 As shown, the mixed C4 composition (% by weight) is: butadiene: 30.0%, isobutene: 12.0%, butene-1: 18.0%, butene-2: 18.2%, butane: 21.8%. According to the technological process of the present invention, the extraction agent 2 adopts dimethylformamide; as described in the background art, the extraction and extraction of butadiene unit includes an extraction column, a water washing column, a rectification column (2) and a rectification column (3). The extraction tower is a sieve tray column, the number of trays is 80, and the operating pressure at the top of the tower is 0.65MPa; the washing tower is a sieve tray tower, the number of trays is 60, and the operating pressure at the top of the tower is 0.4MPa; the rectification tower (2) is a sieve tray The plate column has 50 plates and the operating pressure at the top of the column is 0.6MPa; the rectifying column (3) is a sieve plate column, the number of plates is 80, and the operating pressure at ...

Embodiment 3

[0031] according to figure 1 As shown, the mixed C4 composition (% by weight) is: butadiene: 20.0%, isobutene: 15.0%, butene-1: 18.0%, butene-2: 18.2%, butane: 28.8%. According to the technical process of the present invention, acetonitrile is used as the extraction agent 2; as described in the background art, the extraction and extraction of butadiene unit includes an extraction column, a water washing column, a rectification column (2) and a rectification column (3). The extraction tower is a packed tower, the packing height is 30 meters, and the operating pressure at the top of the tower is 0.55MPa; the water washing tower is a packed tower, the packing height is 20, and the operating pressure at the top of the tower is 0.5MPa; the rectification tower (2) is a valve tower, The number of plates is 43, and the operating pressure at the top of the tower is 0.55 MPa; the rectification tower (3) is a packed tower, the height of the packing is 22 meters, and the operating pressur...

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Abstract

The invention relates to a comprehensive use method of mixed C-4, which mainly aims at solving the problem that the comprehensive utilization ratio of mixed C-4 by-products generated by a steam cracking device and an FCC device is low in the prior art. The method comprises the following steps: (1) adopting an extract technology to obtain butadiene through separation; (2) adopting an etherificationtechnology to synthesize MTBE by using isobutene remained in the C-4 undergoing the extraction in the first step; (3) separating water, ether and alcohol in the C-4 undergoing the etherification in the second step by adopting a refining and separating technology; (4) producing propylene through the disproportionating reaction between the mixed C-4 which is purified in the third step and ethyleneby adopting an olefine disproportionation technology; and (5) cyclically taking the mixed C-4 which is left after the reaction in the fourth step as the raw material of a cracking furnace. Such a technical scheme better solves the problem and can be used in the industrial production for increasing the propylene production and the comprehensive value of the mixed C-4.

Description

technical field [0001] The invention relates to a comprehensive utilization method of mixed C4. Background technique [0002] The present invention relates to a by-product C of a mixed C-4 refers to steam cracking device 4 Distillate and by-product C of catalytic cracking unit 4 Distillate, the mixed C4 produced by steam cracking unit is generally extracted by butadiene, and the MTBE unit utilizes isobutene. Although the remaining mixed C4 contains a large amount of butene-1 and butene-2, most of them are currently used as distillates. For liquefied gas use, some producers will separate and purify butene-1. The mixed C by-product of the catalytic cracking unit 4 Basically used as liquefied gas. Therefore, most of the mixed carbon 4 have not fully utilized their chemical added value, and the comprehensive utilization rate is extremely low. In recent years, there have been many studies on how to comprehensively utilize mixed C4. [0003] Extracting and separating butadie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C9/18C07C11/06C07C7/10C07C41/06C07C6/04
CPCY02P20/52
Inventor 甘永胜钱宏义何志
Owner CHINA PETROLEUM & CHEM CORP
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