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Olefin polymerization inhibitor used in the alkali washing tower of methanol to olefin unit

A technology of methanol to olefins and alkali washing towers is applied in the field of olefin polymerization inhibitors, and can solve the problems of high cost, instability, and complicated operation.

Active Publication Date: 2019-08-06
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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  • Olefin polymerization inhibitor used in the alkali washing tower of methanol to olefin unit
  • Olefin polymerization inhibitor used in the alkali washing tower of methanol to olefin unit
  • Olefin polymerization inhibitor used in the alkali washing tower of methanol to olefin unit

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Dissolve 45g of monosuccinimide in 260g of deionized water, stir well, then add 50g of hydroquinone in turn, heat and stir evenly, then cool and filter, the filtrate is olefin polymerization inhibitor, called ZJI-1 .

[0027] 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 w...

Embodiment 2

[0032] 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

[0034] 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 an olefin polymerization inhibitor for an alkali-washing tower of a methanol-to-olefin production device. The olefin polymerization inhibitor mainly solves the problem that the conventional olefin polymerization inhibitor has poor specificity in an alkali-washing tower, has poor effect, is unstable, is operated through complex processes, has high toxicity and a high cost. The olefin polymerization inhibitor comprises, by weight, 0 to 20 parts of an amine compound and 0 to 10 parts of an alcohol compound. The olefin polymerization inhibitor solves the above technical problem and can be used for controlling and preventing the polymerization of olefins in the alkali-washing tower of the methanol-to-olefin production device.

Description

technical field [0001] The invention relates to an olefin polymerization inhibitor used 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 materials, th...

Claims

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Application Information

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