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Method of inhibiting olefin polymerization in alkaline washing column of methanol-to-olefin (MTO) device

A methanol-to-olefin and olefin polymerization technology, applied in the purification/separation of hydrocarbons, chemical instruments and methods, ethylene production, etc., can solve the problems of cumbersome operation, high cost, instability, etc., to extend the operation cycle and reduce environmental pollution , the effect of inhibiting the production of butter

Inactive Publication Date: 2017-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the existing methods for inhibiting the polymerization of olefins, the pertinence to the alkali washing tower of the methanol-to-olefins device is not strong, the use effect of the existing polymerization inhibitors is not good, unstable, the operation is more cumbersome, and the cost is relatively high. advanced questions

Method used

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  • Method of inhibiting olefin polymerization in alkaline washing column of methanol-to-olefin (MTO) device
  • Method of inhibiting olefin polymerization in alkaline washing column of methanol-to-olefin (MTO) device
  • Method of inhibiting olefin polymerization in alkaline washing column of methanol-to-olefin (MTO) device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 45g of monosuccinimide in 260g of deionized water, stir well, then add 50g of hydroquinone, heat and stir evenly, then cool and filter, the filtrate is the olefin polymerization inhibitor, called ZJI-1.

[0032] The above-mentioned ZJI-1 polymerization inhibitor is applied to the simulated alkali washing tower of the methanol-to-olefins plant, and the feed composition of the alkali washing tower is 41.1% of ethylene, 40.2% of propylene, C 4 11.2%, Acetaldehyde 0.05%, Butanone 0.03%, C 5 + Hydrocarbons 5.58%, CO 2 0.02%, temperature 45°C, sodium hydroxide concentration 10%. Use a piston pump to continuously add the inhibitor into the circulating alkali liquor and then enter the alkali washing tower, the addition amount is 100ppm (relative to the alkali washing tower feed). After 30 days of continuous operation of the device, no tower blockage was found, and the weight of butter in the lye was calculated. And compared with the amount of butter produced when ...

Embodiment 2

[0037] Prepare the olefin polymerization inhibitor ZJI-1 according to the method of Example 1, change the addition amount of the olefin polymerization inhibitor to 300ppm, and evaluate its inhibitory effect on butter production according to the method of Example 1, see Table 1 for details.

Embodiment 3

[0039] Prepare the olefin polymerization inhibitor ZJI-1 according to the method of Example 1, change the addition amount of the olefin polymerization inhibitor to 600ppm, and evaluate its inhibitory effect on butter production according to the method of Example 1, see Table 1 for details.

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Abstract

The invention relates to a method of inhibiting olefin polymerization in an alkaline washing column of a methanol-to-olefin device and mainly solves the technical problems of poor control effect on olefin polymerization, poor targeted applications, instability, complex operations, high toxicity and high cost in an alkaline wash column of an MTO apparatus in the prior art. In the technical scheme, a) an olefin polymerization inhibitor (I) is employed and includes, by weight, 0-20 parts of an amine compound and 0-10 parts of an alcohol compound; and b) the olefin polymerization inhibitor (I) is injected to the alkaline wash column (1) along with an alkaline solution (II) in an online continuous injection manner through an alkaline solution injection line on the alkaline wash column. The method solves the technical difficult problems and can be used for controlling and preventing the olefin polymerization in the MTO apparatus.

Description

technical field [0001] The invention relates to a method for inhibiting olefin polymerization in an alkali washing tower of a methanol-to-olefin device. Background technique [0002] Among low-carbon olefins, ethylene and propylene are important organic chemical raw materials, and their demand is increasing year by year. The traditional route to obtain ethylene and propylene is naphtha cracking, but this route is overly dependent on oil, which has problems such as rising prices and unstable supply in the short term, and limited resource storage in the long term. Therefore, in recent years, as the most promising alternative to naphtha route to olefins, coal or natural gas via methanol to ethylene, propylene and other low-carbon olefins technology (methanol to olefins, MTO or MTP) has received great attention. In the specific production process of methanol to olefins, in order to obtain the target product that meets the purity requirements or to recycle some unreacted materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/20C07C11/04C07C11/06
CPCY02P30/20Y02P30/40
Inventor 姜丽燕李继文王川
Owner CHINA PETROLEUM & CHEM CORP
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