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Method for producing ethylene cracking feed by hydrogenation of dry gas

A technology for ethylene cracking and dry gas, which is applied in the processing of gas mixtures, the petroleum industry, and the treatment of hydrocarbon oil, etc. It can solve the problems of concentrated reaction heat release, large differences in dry gas composition, and difficulty in reaching the target for reaction products, achieving increased The effect of the reaction step

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 varies greatly. Usually, the content of olefins and oxygen in the dry gas produced by most enterprises is in the middle range, that is, the content of olefins is 4%~9%, and the content of oxygen is 600~1200 mg∙m -3 , this kind of dry gas hydrogenation reaction focuses on deoxygenation and deolefination. If it is still produced according to CN103450941A, the reaction product is difficult to reach the target

Method used

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  • Method for producing ethylene cracking feed by hydrogenation of dry gas
  • Method for producing ethylene cracking feed by hydrogenation of dry gas
  • Method for producing ethylene cracking feed by hydrogenation of dry gas

Examples

Experimental program
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Effect test

Embodiment 1

[0060] A fixed-bed reactor was used for the reaction, and the feed was fed from above; the catalyst was loaded in four stages, and the loading ratio was the same as in Comparative Example 1. From top to bottom, the catalysts are A, B, C, and D 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 feed consisted of coker dry gas only, not distillates. The reaction conditions and results are shown in Table 5.

[0061] From the reaction results in Table 5, it can be seen that when the catalyst gradation scheme of the present invention is adopted and only a single coke dry gas feed is used for the hydrogenation reaction, the temperature rise of the reaction bed is up to 61.2°C. Compared with Comparative Example 1, the hot spot temperature has been greatly reduced; the average reaction temperature is 216.2°C, which is beneficial to prolong the service life of the catalys...

Embodiment 2

[0063] A fixed-bed reactor was used for the reaction, and the feed was fed from above; the catalyst was loaded in four stages, and the loading ratio was the same as in Comparative Example 1. From top to bottom, the catalysts are A, B, C, and D 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. In addition to the coking dry gas, the reaction feed also includes refined naphtha, which is fed in parallel with the coking dry gas. The main properties of refined naphtha are shown in Table 4. The reaction conditions and results are shown in Table 5.

[0064] From the reaction results in Table 5, it can be seen that after adopting the two improved methods of catalyst graded loading and introducing refined naphtha, the reaction "temperature bulb" was greatly reduced, and the reaction temperature rise was reduced from the original 110.4°C to 47.9°C ; But the average reaction temperatur...

Embodiment 3

[0072] A fixed-bed reactor was used for the reaction, and the feed was fed from above; the catalyst was loaded in four stages, and the loading ratio was the same as in Comparative Example 1. From top to bottom, the catalysts are A, B, C and D, and their physical properties are listed in Table 3. The feed gas for hydrogenation is coking dry gas, and its composition is shown in Table 2. In addition to coking dry gas, catalytic diesel is also fed into the reaction feed, which is fed in parallel with coking dry gas. The main properties of catalytic diesel are shown in Table 4. The reaction conditions and results are shown in Table 5.

[0073] From the reaction results in Table 5, it can be seen that after adopting the two improved methods of catalyst gradation loading and introducing catalytic diesel oil, the "temperature envelope" of the reaction can also be greatly reduced, and the reaction temperature rise is reduced from the original 110 °C to 45.5 °C; the average reaction ...

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Abstract

The invention discloses a method for producing an ethylene cracking feed by hydrogenation of dry gas. The dry gas containing 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 higher 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 the conversion rate of the hydrogenation reaction of the olefins is enabled to be steadily and gradually improved along a catalyst bed layer; reaction heat is gradually and gently released rather than be centrally released, so that reaction temperature rise of the catalyst bed layer is reduced, a temperature bulb of the catalyst bed layer is greatly gentle, and further the service life of the catalysts is prolonged.

Description

technical field [0001] The invention relates to a low-carbon olefin hydrogenation treatment process. Specifically, it is a method for hydrogenating olefin-containing dry gas to produce ethylene cracking material. 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 companies t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/02
Inventor 艾抚宾徐彤乔凯祁文博方向晨刘平袁毅
Owner CHINA PETROLEUM & CHEM CORP
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