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Process for preparing low-carbon olefin from wax oil fraction

A low-carbon olefins and fractionation technology, which is applied in the field of producing low-carbon olefins from wax oil fractionation, can solve the problems of low cracking ethylene yield, excessive viscosity of tower bottom oil, and short operation period.

Active Publication Date: 2007-09-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The paraffin-based wax oil fraction, especially the normal three minus one fraction, is mainly used for hydrogenation process and catalytic cracking feed. Raw material, and accounts for a relatively high proportion of crude oil, if it is directly used as cracking raw material, because it contains a certain amount of cycloalkanes and aromatics with more than two rings, there are industrial problems such as low cracking ethylene yield, short operation period, and downstream quenching oil. Problems such as tower bottom oil viscosity exceeding the standard

Method used

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  • Process for preparing low-carbon olefin from wax oil fraction
  • Process for preparing low-carbon olefin from wax oil fraction
  • Process for preparing low-carbon olefin from wax oil fraction

Examples

Experimental program
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Embodiment 1

[0021] Put 1000 grams of paraffin-based normal three-minus one-line raw material in an 8-liter dewaxing batch kettle with a stirring device and a heat exchange jacket and heat it to 70°C, then cool it to -20°C. , 0°C, and -20°C, add methyl ethyl ketone (produced by British SHELL company) / toluene (produced by Beijing Yanshan Petrochemical, industrially pure) (50:50v / v), and the agent-oil ratio is 0.8, 1.2, 1.0 (m / m ), the total agent-to-oil ratio is 3.0. Put the mixed material into a vacuum filter, and perform dewaxing and filtration operation at -18°C and a vacuum of 400mmHg. See Table 1 for the properties and composition of the first-line raw materials and wax paste, and Table 2 for the solvent dewaxing process conditions.

[0022] The paraffin-rich wax paste obtained from the dewaxing process is subjected to a cracking test on a simulated cracking evaluation test device. The test device consists of three parts: a feed system, a cracking reaction system and a cryogenic separ...

Embodiment 2

[0027] The wax paste obtained by the solvent dewaxing process in Example 1 was subjected to a cracking test on a simulated cracking evaluation test device, which was the same as that used in Example 1. The cracking operating conditions are as follows: furnace outlet temperature 820°C, furnace outlet pressure (absolute) 211kPa, residence time 0.22 seconds, water-oil ratio 0.75m / m. The results of the cracking evaluation test are shown in Table 3. The data in Table 3 show that: under the condition of high cracking severity, the yield of ethylene and propylene is equivalent to that of naphtha cracking, the amount of cracked tar in the cracked liquid phase product increases slightly, and the hydrogen content is higher than that controlled by LUMMUS Company Indicators, the operating cycle of the cracking furnace is equivalent to that of naphtha.

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Abstract

A method for producing low-carbon olefin from wax oil fraction: heating the raw material of wax oil fraction, cooling down to -10 to -30 Deg. C and adding solvent step by step in the cooling time, separating the mixture of material and solvent to prepare cerate with solvent and dewaxed oil with solvent, and preparing separately cerate and dewaxed oil by dephlegmator, then cerate entering into steam cracker and cracking in 770-850 Deg. C to generate the goal product such as ethene, propone and so on, the separated solvent serving circularly. By such method it can increase the yield of cracked gas and goal product, prolong the running period of the steam cracker, and also extend the material which can prepare ethene by steam cracking, satisfying the demand of the present cracker.

Description

technical field [0001] The invention relates to a method for non-catalytic thermal cracking of hydrocarbon oil in the absence of hydrogen, more specifically, it belongs to a method for producing ethylene with paraffin-based wax oil fraction as raw material. Background technique [0002] With the rapid development of my country's economy, the demand for ethylene and other low-carbon olefins has increased significantly. During the "Tenth Five-Year Plan" period, it is planned to increase the production capacity of about 4.05 million tons of ethylene, and the total capacity will reach about 9 million tons per year. In terms of demand, it is predicted that the demand for ethylene will reach 15 million tons by 2005, an increase of 40%. The annual growth rate of demand for ethylene will reach 8.5% higher than the growth of GDP. At that time, the production capacity of ethylene can only meet 60% of the demand. In 2005, the production capacity of propylene will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/14
Inventor 崔德春李集亮肖荣军张书红
Owner CHINA PETROLEUM & CHEM CORP