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Process for producing ethylene cracking feed by hydrogenation of dry gas

An ethylene cracking and process technology, which is used in the processing of gas mixtures, the petroleum industry, and the treatment of hydrocarbon oil, etc. , the effect of improving the efficiency of use

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved three of the above four difficulties, and compared with CN1800308A, it also simplified the process, but the problem of concentrated heat release and excessively high hot spot temperature (or temperature bulb) was still unsolved
[0008] In addition, the composition of dry gas produced by various enterprises is quite different. Generally, the olefin content in the dry gas produced is 4%~6%, and the oxygen content is 200~300mg∙m -3 , but the content of olefins in the dry gas produced by some enterprises is low, at 1.5%~3.5%, but the content of oxygen is relatively high, at 5000~9000mg∙m -3 , this kind of dry gas hydrogenation reaction should focus on deoxidation. If it is still produced according to CN103450941A, the reaction product is difficult to reach the target

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The reaction adopts a fixed-bed reactor, and feeds from the top; the catalyst is loaded in four stages, and the filling ratio is the same as in Comparative Example 1; from top to bottom, the catalysts are D, C, B, and A in sequence. Its physical properties are listed in Table 3. The feed gas for hydrogenation is coking dry gas, and its composition is shown in Table 2. The reaction conditions and results are shown in Table 4.

[0061] By comparing the data of Comparative Example 1 and Implementation 1 in Table 4, it can be seen that when the catalyst gradation scheme of the present invention is used to carry out the hydrogenation reaction of coking dry gas, the feed temperature of coking dry gas drops from 177°C to 165°C; Example 1 The temperature rise of the reaction bed was 116°C, and the average reaction temperature was 240.8°C; the olefin content and oxygen content in the hydrogenation product were 0.28mol% and 0.65 mg·m -3 ,Conformity. This shows that this packin...

Embodiment 2

[0064] A fixed-bed reactor was used for the reaction, and materials were fed from above; the catalyst was loaded in four stages, and the loading ratio was the same as in Comparative Example 1; The feed gas for hydrogenation is thermally cracked dry gas, and its composition is shown in Table 2. The reaction conditions and results are shown in Table 4.

[0065] By comparing the data of Comparative Example 2 and Implementation 2 in Table 4, it can be seen that when the catalyst gradation scheme of the present invention is used to carry out the hydrogenation reaction of thermally cracked dry gas, the feed temperature of thermally cracked dry gas drops from 180°C to 167°C; The temperature rise of the reaction bed in 2 was 120 °C, and the average reaction temperature was 246.0 °C; the olefin content and oxygen content in the hydrogenation product were 0.15 mol% and 0.48 mg m -3 ,Conformity. This shows that this packing scheme can increase the temperature of the inlet section of th...

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PUM

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Abstract

The invention discloses a process for producing a ethylene cracking feed by hydrogenation of dry gas containing olefins. The dry gas containing the olefins and optional supplemented hydrogen enter a fixed bed hydrogenation reactor in a parallel flow manner and are in contact with hydrogenation catalysts under a process condition of hydrogenation for reacting; an obtained reaction product is separated to obtain olefin-saturated dry gas; two or more reaction sections are arranged in the hydrogenation reactor; according to the contact sequence of the catalysts and materials, the activity of the hydrogenation catalyst in a downstream reaction section is lower than that of the hydrogenation catalyst in an upstream reaction section. According to the method disclosed by the invention, the speed of the hydrogenation reaction of the olefins can be controlled, and hydrogenation reaction heat of oxygen and the olefins is released more quickly and gently and is sufficiently utilized; moreover, the efficiency of the catalysts is sufficiently realized, and the influence on the service life of the catalysts is avoided.

Description

technical field [0001] The invention relates to a process for hydrogenation treatment of low-carbon olefins, more specifically, a process for preparing ethylene cracking material by hydrogenating dry gas containing olefins. Background technique [0002] At present, most of the raw materials used in my country's ethylene plants are naphtha (naphtha accounts for 64%, hydrogenated tail oil accounts for 10%, and light diesel oil accounts for 10%). Ethylene raw materials are the most important factor affecting the cost of ethylene. Raw materials It accounts for 70% to 75% of the total cost, or even higher. In recent years, domestic petrochemical enterprises have built and expanded several sets of large-scale ethylene production units. Although the source of raw materials has been expanded in actual production, the raw materials for ethylene cracking are still quite tight; It also rises accordingly, and the economics of ethylene production units become worse. The reality forces c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/02
Inventor 艾抚宾祁文博乔凯徐彤刘平方向晨袁毅
Owner CHINA PETROLEUM & CHEM CORP