Separation method for producing light olefins from oxygenated chemicals

A separation method and technology of carbon olefins, applied in the direction of purification/separation of hydrocarbons, hydrocarbons, hydrocarbon cracking and hydrocarbon production, etc., can solve problems such as inappropriateness, achieve good applicability, reduce equipment investment and operation difficulty, and reduce equipment Effects of investment and energy consumption

Inactive Publication Date: 2011-02-16
EAST CHINA ENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the premise of this invention is the deethanization process before use, and it is not suitable to use ethane and propane mixed absorbent

Method used

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  • Separation method for producing light olefins from oxygenated chemicals
  • Separation method for producing light olefins from oxygenated chemicals
  • Separation method for producing light olefins from oxygenated chemicals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1, the low-carbon hydrocarbons from the reaction are cooled after heat recovery, compression and purification, and first enter the depropanizer under the conditions of 2.1MPa and 15°C. The demethanizer uses ethane as the absorbent, and the temperature of the ethane absorbent is -24°C. Table 1 is the calculation result of the problem. It can be seen from the table that when the mass flow rate of ethylene in the control light component is the same, the ethane absorbent required is less than the propane absorbent, and the ethane mass flow rate is only 2-3 of that of propane, although The loss of ethane with light components is much more than that of propane, but the lost ethane does not reduce its utilization value and can still be used as fuel gas. Using propane as absorbent, the loss of propane is 672kg-h, and the annual loss is 5376t. Originally propane can be sold as LPG by-product, but at this time it can only be used as fuel gas, which seriously reduces ...

Embodiment 2

[0035] like figure 2 , the low-carbon hydrocarbons from the reaction are cooled after heat recovery, compression and purification, and first enter the depropanizer under the conditions of 2.1MPa and 15°C, and the gas phase at the top of the depropanizer is compressed to 3.4MPa and cooled to -30°C. In the methane tower, due to the low selectivity of ethane in the product, if ethane is used as the absorbent, the amount of ethane lost with the light components is greater than that of the product ethane. If all ethane is used as the absorbent, part of the ethane needs to be purchased. Consider adding propane as absorbent at this time. It can also be seen from Table 2 that compared with the complete use of propane as absorbent, the total mass of absorbent is less, and the loss of propane is reduced by 560kg-h, and the annual loss of propane is reduced by about 4480t.

[0036] Table 1 embodiment 1 calculation result compares with completely using propane as absorbent

[0037] ...

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Abstract

The invention discloses a separation method for producing light olefins from oxygenated chemicals. In the method, a product from a reactor for producing the light olefins from the oxygenated chemicals and/or a product generated from olefins catalytic cracking are mixed, and the mixture is treated by a series of pretreatment steps of heat recovery, compression, purification, cooling and the like and is separated into gas-phase hydrocarbon and liquid-phase hydrocarbon; the gas-phase hydrocarbon and the liquid-phase hydrocarbon respectively enter different column plates of a depropanizing column to be in (C3-)-(C4+) separation; after being subjected to further compressing and cooling, light components of C3 and below on the top of the depropanizing column enter the depropanizing column, and ethane is used as an absorbent on the top of the depropanizing column to enhance the recovery rate of the ethane; C2-C3 at the bottom of the depropanizing column enter a deethanizing column to separate C2 and C3; the C2 enters an ethylene rectifying column, ethylene is produced through side drawing, noncondensable gas on the top of the ethylene rectifying column returns to a compressor, after totally cooling, the ethane at the bottom of the column is recovered as an absorbent of a demethanizing column or partly as fuel gas; and C3 enters a propylene rectification tower, propylene is recovered on the tower top, and propane is recovered at the tower bottom, as an LPG (Liquid Petroleum Gas) byproduct. The invention has the advantages of high ethylene yield, low energy consumption, little investment and the like, and the byproduct can be effectively utilized.

Description

technical field [0001] The invention belongs to the technical field of separation of low-carbon hydrocarbons, and in particular relates to a separation method for preparing low-carbon olefins from oxygen-containing compounds or catalytic cracking of olefins. Background technique [0002] Ethylene and propylene are the basic raw materials of the petrochemical industry, and their products polyethylene and polypropylene are important engineering plastics. Traditionally, ethylene and propylene are mainly produced by naphtha tubular steam cracking, which is heavily dependent on petroleum resources. With the increasingly tight supply of oil, the production of low-carbon olefins from oxygenated compounds has become a research hotspot and has been greatly developed. Oxygenated compounds include alcohols, ethers, aldehydes and ketones, among which methanol and dimethyl ether are widely used. , which can be produced from coal or natural gas, which can alleviate the pressure on oil sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/12C07C4/06C07C11/06C07C7/00C07C7/11C07C11/04
CPCY02P20/10Y02P20/50Y02P20/52Y02P30/40
Inventor 江家贵蔡林清王建平郭勇义吴越峰肖红胡存赵磊吴双月陆俊峰
Owner EAST CHINA ENG SCI & TECH
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