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Method for preparing propylene by using etherified C4 and ethylene

A technology of C4 and ethylene after ether, which is applied in the direction of double decomposition reaction to hydrocarbon, organic chemistry, etc., can solve the problems of low selectivity of target products, low utilization rate of C4 raw materials, etc., and achieve the effect of improving utilization rate and benefiting life

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is the problem of low target product selectivity and low utilization rate of C4 raw materials in the prior art, and a new method for producing propylene from C4 and ethylene after ether is provided

Method used

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  • Method for preparing propylene by using etherified C4 and ethylene
  • Method for preparing propylene by using etherified C4 and ethylene
  • Method for preparing propylene by using etherified C4 and ethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this reaction, the flow rate of ethylene is 34733.3Kg / h, the ratio of ethylene and butene is 2:1 in terms of molar ratio, and the material balance is shown in Table 2.

[0033] Step 1: First, the ether C4 stream and ethylene are respectively passed through respective adsorption towers (adsorption tower 30 and adsorption tower 31) to remove impurities in the raw material, and the main products 5 and 6 removed in the two adsorption towers mainly include Water, alcohol and ether, the adsorbent is 13X molecular sieve, the content of water after the raw material passes through the adsorbent is 3ppmw, the content of carbon dioxide is 0.5ppmw, the content of total sulfur is 0.2ppmw, the content of total nitrogen is 0.3ppmw, and the content of total oxygenated compounds The content is 0.6ppmw, the content of total halides is 0.1ppmw, and the content of heavy metal components is 0.2ppb.

[0034] Step 2: Mix 55600kg / h post-ether C4 material 3 and 34733.3Kg / h ethylene material 4 ...

Embodiment 2

[0041] In this reaction, the flow rate of ethylene is 17366.6Kg / h, the ratio of ethylene and butene is 1:1 in terms of molar ratio, and the material balance is shown in Table 3.

[0042] According to each step in embodiment 1, change total ethylene material 3 to be 17366.6Kg / h, change the weight ratio of disproportionation catalyst and isomerization catalyst to be 1: 5, change operating conditions to be: reaction temperature 250 ℃, reaction pressure 0.1MPa , the mass space velocity of C4 1h -1 ; Change the operating conditions of the debutanizer to: 50 trays, tower top: 1MPa, 40°C; the operating conditions of the deethylene tower: 140 trays, tower top: 0.5MPa, -65°C; The operating conditions are: 240 trays, tower top: 1.7MPa, 40°C;

[0043] The composition analysis of material in the reaction process of table 3

[0044]

Embodiment 3

[0046] In this reaction, the flow rate of ethylene is 56149.8Kg / h, the ratio of ethylene and butene is 3:1 in terms of molar ratio, and the material balance is shown in Table 4.

[0047] According to each step in embodiment 1, only change total ethylene material 3 to be 56149.8Kg / h and the weight ratio of disproportionation catalyst and isomerization catalyst to be 1: 5; Change operation condition to be: 350 ℃ of reaction temperatures, reaction pressure 1MPa, The mass space velocity of C4 is 10h -1 ; Change the operating conditions of the debutanizer to: 60 trays, tower top: 1.5MPa, 50°C; the operating conditions of the deethylene tower: 150 trays, tower top: 0.7MPa, -60°C; The operating conditions of the tower are: 250 trays, tower top: 1.9MPa, 50°C;

[0048] The composition analysis of material in the reaction process of table 4

[0049]

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Abstract

The invention relates to a method for preparing propylene by using etherified C4 and ethylene, and mainly solves the problems of low selectivity of target products and low utilization rate of raw materials existing in the prior art. The invention has the technical scheme that the etherified C4 and the ethylene are taken as raw materials and the method sequentially comprises the following steps that: (1) a raw material I obtained by removing water, alcohol, ether and sulfur-containing impurities in the raw materials and ethylene material flow II are mixed and then treated by using an isomerization catalyst to obtain material flow III containing butene-2 with the weight content of more than 80 percent; (2) the material flow III reacts to generate reaction product material flow IV containing ethylene, propylene, butene and a trace amount of C5 component under the action of a disproportionation catalyst and the isomerization catalyst; (3) the material flow IV is subjected to ethylene removal through an ethylene removal tower so as to obtain material flow V containing propylene, butane and a trace amount of C5; (4) the material flow V is separated by using a depropenizer so as to obtain a propylene product and material flow VI containing butane and a trace amount of C5; and (5) a trace amount of hydrocarbon above C5 in the material flow VI is removed through a debutanizer so as to obtain material flow VII containing the butane. The method can be used for the industrial production of the propylene by using the etherified C4 and the ethylene.

Description

technical field [0001] The invention relates to a method for producing propylene from carbon four after ether and ethylene. Background technique [0002] In recent years, with the continuous economic development of the third world countries, the market demand for light olefins (including ethylene, propylene, etc.) will continue to increase. Propylene is one of the most important basic organic raw materials second only to ethylene, and its largest use is to produce polypropylene (accounting for about half of its total), followed by the production of acrylonitrile, propylene oxide, isopropanol, and cumene , carbonyl alcohols, acrylic acid, propylene oligomers. [0003] The traditional methods of ethylene co-production and refinery recovery of propylene are obviously difficult to meet the growing demand for propylene. The use of olefin disproportionation technology can digest C without reducing the cracking severity of naphtha. 4 Distillate, and can increase the production of...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C6/04
Inventor 宣东王仰东
Owner CHINA PETROLEUM & CHEM CORP
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