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Combination method for comprehensive utilization of mix C4

A technology of mixed C4 and combined methods, applied in chemical instruments and methods, purification/separation of hydrocarbons and hydrocarbons, etc., can solve the problems of low comprehensive utilization rate of added value in chemical utilization, and achieve increased value and good technical effect. Effect

Active Publication Date: 2009-07-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Combination method for comprehensive utilization of mix C4
  • Combination method for comprehensive utilization of mix C4
  • Combination method for comprehensive utilization of mix C4

Examples

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Effect test

Embodiment 1

[0027] according to figure 1As shown, the mixed carbon four composition (weight %) is: butadiene: 40.0%, isobutene: 12.0%, butene-1: 18.0%, butene-2: 18.2%, butane: 11.8%. Adopting the technological process of the present invention, the extractant 2 adopts acetonitrile; as introduced in the background technology, the extraction and extraction butadiene unit includes an extraction tower, a water washing tower, a rectification tower (2) and a rectification tower (3). The extraction tower is a floating valve tower with a plate number of 60 and a tower top operating pressure of 0.45MPa; the washing tower is a floating valve tower with a plate number of 50 and a tower top operating pressure of 0.6MPa; the rectifying tower (2) is a floating valve tower. Valve tower, number of trays is 40, tower top operating pressure is 0.5MPa; Rectification column (3) is a floating valve tower, number of trays is 60, tower top operating pressure is 0.8MPa. The catalyst used in the reaction section...

Embodiment 2

[0029] according to figure 1 As shown, the mixed carbon four composition (weight %) is: butadiene: 30.0%, isobutene: 12.0%, butene-1: 18.0%, butene-2: 18.2%, butane: 21.8%. Using the process flow of the present invention, the extractant 2 adopts dimethylformamide; as introduced in the background technology, the extraction and extraction butadiene unit includes an extraction tower, a water washing tower, a rectification tower (2) and a rectification tower (3). The extraction tower is a sieve tray tower with 80 trays and an operating pressure of 0.5MPa at the top of the tower; the water washing tower is a sieve tray tower with 60 trays and an operating pressure of 0.5MPa at the top of the tower; the rectifying tower (2) is a sieve tray Plate column, the number of trays is 60, and the operating pressure at the top of the tower is 0.6MPa; The rectifying column (3) is a sieve tray column, the number of trays is 68, and the operating pressure at the top of the tower is 0.6MPa. The ...

Embodiment 3

[0031] according to figure 1 As shown, the mixed carbon four composition (weight %) is: butadiene: 20.0%, isobutene: 15.0%, butene-1: 18.0%, butene-2: 18.2%, butane: 28.8%. Using the process flow of the present invention, the extractant 2 adopts dimethylformamide; as introduced in the background technology, the extraction and extraction butadiene unit includes an extraction tower, a water washing tower, a rectification tower (2) and a rectification tower (3). The extraction tower is a packed tower, and the height of the packing is 30 meters, and the operating pressure at the top of the tower is 0.8MPa; the washing tower is a packed tower, and the height of the packing is 20 meters, and the operating pressure at the top of the tower is 0.4MPa; The packing height is 20 meters, and the operating pressure at the top of the tower is 0.8 MPa; the rectifying column (3) is a sieve tray column, the number of trays is 68, and the operating pressure at the top of the tower is 0.6 MPa. T...

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Abstract

The invention relates to a combination method for using mixed C4 comprehensively. The method mainly solves the problem that the chemical industrial utilization added value and the comprehensive utilization rate of a byproduct of the mixed C4 of a steam cracking device and the byproduct of the mixed C4 of an FCC device in the prior art are low. The method solves the problem well by the technical proposal which comprises the steps as follows: 1) extraction technology is adopted to obtain butadiene separating; 2) catalytic distillation technology is used for ensuring that butylene-1 in C4 which is remained after being extracted in step 1 is isomerized into butylene-2 and is also separated to obtain isobutene; 3) olefin disproportionation technology is used for disproportionating the butylene-2 in the rest of the mixed C4 in step 2 and ethene to produce propylene; and 4) the remained mixed C4 in step 3 is recycled as a cracking raw material. The invention can be used in the industrial production for increasing the production of the propylene and improving the comprehensive utilization value of the mixed C4.

Description

technical field [0001] The invention relates to a combined method for comprehensively utilizing mixed carbon four. Background technique [0002] Mixed carbon four refers to the by-product C of the steam cracking unit 4 Distillates and by-products of catalytic cracking units C 4 Distillate, the mixed C4 by-product of the steam cracking unit is generally extracted from butadiene, and the MTBE unit utilizes isobutene. Although the last remaining mixed C4 contains a large amount of butene-1 and butene-2, most of it is used as For the use of liquefied petroleum gas, some manufacturers will separate and purify butene-1. And the mixed C produced by the catalytic cracking unit 4 Basically used as liquefied gas. Therefore, most of the mixed C4s 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 carbon four. [0003] Extraction and separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C6/02C07C5/23C07C11/08C07C11/06C07C11/16
CPCY02P20/10
Inventor 甘永胜钱宏义
Owner CHINA PETROLEUM & CHEM CORP
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