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Purification technique for producing propylene by refinery plant

A purification process and propylene technology, applied in the petrochemical field, can solve the problems of inability to carry out production, imperfect purification process, large consumption of polymerization catalyst, etc., and achieve the effect of reducing production products

Inactive Publication Date: 2008-09-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the purification technology for propylene produced in refineries is only hydrolysis of carbonyl sulfide and zinc oxide to dehydrogen sulfide. The obtained propylene is then dehydrated by copper-based catalysts and molecular sieves before entering the propylene polymerization unit. The imperfect purification process leads to many impurities entering the polymerization section. , resulting in high consumption of polymerization catalysts, on the other hand, changes in refinery raw materials will lead to non-polymerization of propylene, and production cannot proceed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] An epichlorohydrin plant needs 8 tons of propylene per hour. It originally used imported propylene. Due to the rapid rise in the price of imported propylene, it had to use atmospheric propylene produced by a nearby refinery. Using the purification process and adsorbent of the present invention, it has been in normal operation for one year. many. The specific process is that the raw material crude propylene enters the carbonyl sulfide hydrolysis and desulfurization reactor (i.e. step b), and the inorganic dechlorination agent is installed inside. The inorganic dechlorination agent is potassium salt containing 8% (calculated as potassium oxide) and 92% activated alumina. (carrier) composition, then enter the dearsenic dephosphorization reactor (step e), with 6m 3 The arsenic and dephosphorization agent is a composition containing 30% (calculated as copper oxide) of metal copper and the remainder of activated alumina (carrier), and finally obtained pure propylene enters th...

Embodiment 2

[0072] A butyl octanol plant needs 6.5 tons of propylene per hour. Since there is no cracking propylene raw material available, it can only use propylene produced by the refinery. The purification process is as follows:

[0073] Propylene produced by the refinery, into two 10m 3 The alkali tower of block sodium hydroxide, the two towers can be operated intermittently, and then enter the 10m 3 Carbonyl sulfide hydrolyzer, 10m 3 Zinc oxide desulfurizer and 5m 3 The desulfurization tower of the fine desulfurizer, the desulfurized propylene enters into the 3m 3 Inorganic dechlorination agent, 8m 3 Arsenic and dephosphorization agent and 5m 3 In the tower that removes oxygen-containing and nitrogen-containing compound adsorbents, it finally enters and passes through the built-in 5m 3 Molecular oxygen adsorbent, a tower that produces qualified refined propylene.

[0074] The above-mentioned inorganic dechlorination agent is a composition containing 10% (calculated as potassium...

Embodiment 3

[0079] The refinery produces 12 tons / h of crude propylene, and the specific process is as follows:

[0080] The crude propylene produced in the refinery goes through the two alkali towers and then enters the No. 3 tower. The alkali tower is equipped with a mixture of potassium hydroxide and sodium hydroxide (1:4, or 1:1, or 4:1) alkali block, which can be intermittently operation, the above No. 3 tower is equipped with 15m 3 Carbonyl sulfide hydrolyzer, 15m 3 Zinc oxide desulfurizer and 10m 3 Fine desulfurizer, the desulfurized propylene enters the No. 4 tower and passes through 10m 3 Inorganic deoxidizer, 5m 3 Organic dechlorination agent, 15m 3 Oxygen-containing and nitrogen-containing compound adsorbent and 7m 3 After the molecular oxygen adsorbent, it enters the No. 6 tower of the alkali tower for the second time, and the No. 6 tower is equipped with 10m 3 Block potassium hydroxide, used to remove CO released by hydrolysis of carbonyl sulfide 2 , and finally enter t...

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PUM

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Abstract

The invention provides a purification process for propone produced in refinery, wherein the raw material is propone produced in refinery, and the process comprises: passing a carbonyl sulfide hydrolytic reactor containing carbonyl sulfide hydrolytic agent therein and a zinc oxide desulfurization reactor containing zinc oxide desulfurization agent therein; passing a fine desulfurization reactor containing fine desulfurization agent therein; passing a dechlorination reactor containing an inorganic antichlor and an organic antichlor; passing a dearsenization and dephosphorization reactor containing dearsenization and dephosphorization agents, passing a de- oxygen-containing and nitrogen-containing compound reactor containing oxygen-containing and nitrogen-containing compound adsorbents therein; obtaining a purified product. The product can take place cracking propone for polymerizing monomer and catalytically synthesizing organic compounds, to increase value of propone produced in refinery, and to expand the application ranges of propone produced in refinery.

Description

technical field [0001] The invention relates to a purification technology of olefins in the petrochemical field, in particular to a purification technology of propylene produced in a refinery. Background technique [0002] With the high oil price, the government control of liquefied gas price and the rapid expansion of production scale of enterprises have brought about the expansion of liquefied gas transportation radius and the increase of transportation costs; the rapid development of coal chemical industry has brought dimethyl ether to replace liquefied petroleum gas The increase in share; and the diversification and inferiority of China's crude oil imports have led to a decline in the quality and efficiency of petroleum liquefied petroleum gas, which has led to an increasingly strong driving force for fully utilizing liquefied petroleum gas resources. The fine separation and purification of the olefin components of the obtained olefins are used to replace the cracked ole...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C7/148
Inventor 周红军张文慧周广林
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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