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Combination technique for producing olefin hydrocarbon with mixed C_4

A technology of mixing C4 and olefins, which is applied in the direction of hydrocarbon cracking, organic chemistry, etc., can solve the problem that C4 resources are not fully and effectively utilized, and achieve the goal of meeting market demand, avoiding interference, and high propylene yield Effect

Inactive Publication Date: 2008-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In order to solve the problem that the existing C4 resources are not fully and effectively utilized, the present invention proposes a combined technology for making full use of mixed C4 resources to produce ethylene and propylene

Method used

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  • Combination technique for producing olefin hydrocarbon with mixed C_4
  • Combination technique for producing olefin hydrocarbon with mixed C_4
  • Combination technique for producing olefin hydrocarbon with mixed C_4

Examples

Experimental program
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Embodiment 1

[0051] Reference attached Figure 4 Describe the process.

[0052] The cracked gas produced by thermal cracking of naphtha has a temperature of 820°C and a pressure of 0.15MPa. It enters the quenching system and is cooled to 40°C. The heavy components are removed, and then enters the compression separation system to obtain ethylene, propylene, mixed C4 and C5 respectively. Equal weight components. The mixed C4 component obtained from the separation system has a temperature of 40°C and a pressure of 0.3 MPa. The main composition and its mass percentage content are: 1,3-butadiene 50%, isobutane 0.5%, n-butane 2.3%, trans -2-butene 7.3%, cis-2-butene 5.1%, isobutene 22.8%, 1-butene 10%. The cracked mixed C4 enters the selective hydrogenation reactor to remove the diolefins and alkynes therein. The reactor is a fixed-bed reactor, and the catalyst is a Group VIII metal catalyst added with rare earth elements, such as the catalyst for the selective hydrogenation of alkynes and di...

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Abstract

The invention discloses a compounding technology of preparing olefin with compound C4, which solves the problems that the C4 resource is unable to be fully utilized and the schizolysis separation cryogenic system has relatively much recycle hydrogen. The invention is characterized in that the compounding technology takes schizolyzied C4 or refined C4 as raw material; combines an ethylene device; combines technologies such as olefin catalyses and schizolysis, hydrogenation and steam thermal schizolysis to respectively process C4olefin and alkane; the C4 single olefin which comprises no dialkene and alkyne is transformed into low carbon olefin which mainly comprises propylene through the olefin catalyses and the schizolysis; and the alkane is transformed into low carbon olefin which mainly comprises ethylene through steam thermal schizolysis so as to maximally produce the ethylene and the propylene. The invention has the advantages that the compounding technology fully utilizes the C4 resource, thereby obtaining maximal economic benefit; the expensive schizolysis raw materials, for example naphtha, are replaced with the cheap refined C4, thereby decreasing the production cost, avoiding the interference of organic sulfur, decreaseing the load of the cold area and reducing the energy consumption.

Description

technical field [0001] The present invention relates to a method for producing ethylene and propylene with mixed C4, in particular, it relates to a method of using cracked C4 or refinery C4 as raw material, adopting olefin catalytic cracking, hydrogenation, steam thermal cracking, separation, etc. Combined technology, the method of producing ethylene and propylene. Background technique [0002] With the improvement of my country's ethylene production and crude oil processing capacity, steam cracking units and catalytic cracking units will by-produce a large amount of C4 hydrocarbons. Classes) are also in urgent need of finding new chemical utilization pathways. The production of ethylene and propylene from a large amount of surplus and cheap C4 hydrocarbons is an important way to combine oil and chemical industry and efficiently utilize C4 resources, which can bring significant economic benefits to petrochemical enterprises. [0003] Conventional ethylene units generally us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/06C07C11/04C07C11/06
Inventor 程建民张勇李东风王定博戴伟陈硕张兆斌乐毅刘小波侯经纬刘智信
Owner CHINA PETROLEUM & CHEM CORP
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