Method for inhibiting coking of ethylene cracking device

A technology of ethylene cracking and ethylene cracking raw materials, which is applied in the field of coking suppression in ethylene cracking units, can solve the problem of uneven coking, achieve the effects of reducing coking, saving operating costs, and overcoming uneven coking

Inactive Publication Date: 2019-07-23
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the problem of uneven coking in the ethylene cracking unit existing in the prior art. The present invention provides a method for suppressing coking in the ethylene cracking unit. Moreover, it can meet the production demand, reduce the consumption of chemical additives in the ethylene cracking unit, and has the advantages of cost reduction and efficiency increase

Method used

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  • Method for inhibiting coking of ethylene cracking device
  • Method for inhibiting coking of ethylene cracking device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The composition of ethylene cracking feed gas is shown in Table 1.

[0030] Table 1

[0031] Component volume% Ethylene0.2 Ethane99.75 Acrylic0.03 Propane0.02

[0032] The coking inhibitor is selected from the gas obtained in the catalytic cracking gas separation section. The composition of the gas is shown in Table 2.

[0033] Table 2

[0034] Component volume% Hydrogen sulfide2.938 hydrogen61.772 Methane23.786 Ethane4.026 Propane3.098 Isobutane1.820 N-butane 1.264 C5

1.296

[0035] Such as figure 1 As shown, the coking inhibitor containing hydrogen sulfide shown in Table 2 with a flow rate of 45000ml / min is added to the ethylene cracking feed gas with a flow rate of 30t / h shown in Table 1 (calculated as the sulfide in the coking inhibitor, sulfide The concentration in the ethylene cracking feedstock is 150vppm), so that the coking inhibitor and the gaseous ethylene cracking feedstock enter the ethylene cracking unit together at 60°C. The flow control valve i...

Embodiment 2

[0040] According to the method of Example 1, the difference is that the coking inhibitor containing hydrogen sulfide shown in Table 2 with a flow rate of 60000ml / min is added to the ethylene cracking feed gas with a flow rate of 30t / h shown in Table 1 (using the coking inhibitor The concentration of sulfide in the ethylene cracking feedstock is 200 vppm. The coking inhibitor and the gaseous ethylene cracking feedstock enter the ethylene cracking unit together at 70°C.

[0041] The content of coking inhibitor in 6 groups of cracking furnaces was measured according to the method of Example 1. The results are shown in Table 3.

[0042] The content of carbon monoxide in hydrogen was measured according to the method of Example 1, and the results are shown in Table 3.

[0043] The coking condition of the cracking furnace was detected according to the method of Example 1. After 90 days of operation, the cracking furnace needs to be shut down and the cracking furnace is decoked.

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Abstract

The invention relates to the field of ethylene cracking, and discloses a method for inhibiting coking of an ethylene cracking device. The method for inhibiting coking of the ethylene cracking device comprises steps as follows: before and / or when ethylene cracking materials are added to the ethylene cracking device, adding a coking inhibitor containing gaseous sulfur compounds to the ethylene cracking device. The method has a better coking inhibiting effect, enables the ethylene cracking device to coke evenly, can meet the production requirements, reduces consumption of chemical additives in the ethylene cracking device, and has the advantages of reducing cost and improving effects.

Description

Technical field [0001] The invention relates to the field of ethylene cracking, in particular to a method for inhibiting coking in an ethylene cracking unit. Background technique [0002] Ethylene cracking refers to the use of petroleum hydrocarbon raw materials such as liquefied petroleum gas, C 5 , Naphtha and hydrogenation tail oil, etc. under high temperature conditions, the process of carbon chain scission and dehydrogenation reaction to generate olefins and other products. The reaction of hydrocarbon cracking is very complex, including chemical reactions such as dehydrogenation, chain scission, isomerization, dehydrocyclization, aromatization, dealkylation, polymerization, condensation and coking. Therefore, the cracking reaction is a comprehensive process of many chemical reactions, and the petroleum hydrocarbon feedstock used for cracking is a mixture of multiple single hydrocarbons. Therefore, the cracking reaction process of hydrocarbons is more complicated. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/00
CPCC10G70/00C10G2300/1081
Inventor 王睿智茂轩蒋明敬张孝明陈志云徐磊杰忻慧琦孙敏杰吴剑王建伟周能冬袁子中
Owner CHINA PETROLEUM & CHEM CORP
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