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Method of hydrogenating liquefied petroleum gas to prepare ethylene cracking feed

A technology for liquefied petroleum gas and ethylene cracking, which is applied in the petroleum industry, hydrotreating process, and hydrocarbon oil treatment. The effect of the operating cycle

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1145891A has introduced a kind of hydrogenation method, but this method is only applicable to C 5 Distillate Hydrogenation to Pentane
[0015] Furthermore, currently in industry C 4 There are still the following problems in the production of distillate hydrogenation: (1) The reaction temperature is high, and the reaction result is greatly affected by the thermodynamic equilibrium
Industry C 4 The distillate is used as ethylene cracking material after hydrogenation, and the target requirement is that the olefin content is less than 1.0v%. For this reaction, when the reaction temperature exceeds 340°C, the olefin content in the reaction product is very difficult due to the influence of the chemical balance. reach target
(2) Coking is easy at the entrance of the reaction bed, and the resistance of the reaction bed increases rapidly, resulting in frequent shutdowns of the production equipment for decoking, so as to reduce the resistance of the reaction bed and maintain normal production

Method used

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  • Method of hydrogenating liquefied petroleum gas to prepare ethylene cracking feed
  • Method of hydrogenating liquefied petroleum gas to prepare ethylene cracking feed
  • Method of hydrogenating liquefied petroleum gas to prepare ethylene cracking feed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0032] Take 100ml of FH-40C catalyst, and put it into two stainless steel reactors with an inner diameter of 25mm and a length of 1200mm. Reaction raw materials: hydrogen is electrolytically purified hydrogen with a purity >99%; the C4 fraction is obtained from Fushun Petroleum No. 2 Plant, and its composition is shown in Table 3. The reaction is upper feed, the reaction material flows out from the bottom of the reactor, and enters the separator after cooling, the tail gas is discharged from the top of the separator, the liquid phase at the bottom is regularly sampled, and the composition is analyzed by gas chromatography. During normal operation, the reaction material first enters the first reaction section 3, and then enters the second reaction section 4. The operation mode of the valves is: 21, 22, 23, 24 are opened, and 31, 32, 33, 34 are closed. The specific reaction conditions and results are listed in Table 4.

[0033] Table 3 Composition of industrial carbon four frac...

Embodiment 1

[0039] The stability experiment of embodiment 1. When the reaction temperature rise in the first stage drops by 10°C (that is, when the reaction temperature rises to 110°C), the operation of the first reaction stage and the second reaction stage is switched, that is, the reaction materials enter the second reaction stage first, and then enter the first reaction stage. In the reaction section, other operating conditions remain unchanged, and the operation mode of the valve is: 21, 22, 23, and 24 are closed, and 31, 32, 33, and 34 are opened. At this time, the temperature rise of the reaction section that is first in contact with the reaction material returns to 120°C, while the second reaction section (originally the first reaction section) has a low total temperature rise and a high inlet temperature, so the reaction can still be achieved without raising the temperature. Requirements, that is, without other changes, the recovery of the activity of the reaction system can be re...

Embodiment 3

[0043] The stability experiment of embodiment 3. When the temperature rise of the first stage of reaction drops by 30°C (that is, when the reaction temperature rises to 110°C), the operation of the first reaction stage and the second reaction stage is switched, that is, the reaction material enters the second reaction stage first, and then enters the first reaction stage. In the reaction section, other operating conditions remain unchanged. At this time, the temperature rise of the reaction section that is in contact with the reaction material first returns to 130°C, and the reaction control index can be reached by only increasing the reaction temperature by 2°C in both reaction sections.

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Abstract

The invention discloses a method of hydrogenating liquefied petroleum gas to prepare ethylene cracking feed, which is provided with two reaction sections. Reaction material cooling operation is carried out between the two reaction sections, the mixture of C4 fraction raw material and hydrogen is cooled after passing through the first reaction section, then enters the second reaction section, non-precious metal hydrofining catalysts are arranged in the two reaction sections, and a reaction material flow switching device is arranged between an inlet and an outlet of the two reaction sections to change the sequence of the reaction material flow entering the two reaction sections. The method disclosed by the invention solves the problem that the olefin content does not reach the standard due to thermodynamic control factors, simultaneously the catalysts are entirely fully utilized, and the operating cycle can be prolonged.

Description

technical field [0001] The invention relates to a method for preparing ethylene cracking material from liquefied petroleum gas, especially by C 4 The distillate is used as the reaction raw material, and the ethylene cracking material is prepared by hydrogenation treatment. Background technique [0002] With the development of oil refining industry, especially the continuous development of catalytic cracking technology, people pay more and more attention to the deep processing of refinery gas. There are many ways to utilize refinery gas, among which hydrogenation of liquefied gas is one of the topics that people generally pay attention to. Liquefied petroleum gas has many uses after hydrogenation, such as ethylene cracking raw material, raw material for maleic anhydride synthesis, and vehicle liquefied gas. Among them, liquefied petroleum gas is used as ethylene raw material because of its large amount and many production devices involved, so it is prepared attention. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/04C10G50/00
Inventor 乔凯方向晨艾抚宾郭蓉徐彤
Owner CHINA PETROLEUM & CHEM CORP
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