Method and device for preparing ethylene-vinyl acetate-vinyl alcohol copolymer

A vinyl acetate copolymer and vinyl acetate technology, which is applied in the field of preparing ethylene-vinyl acetate copolymer, can solve the problems of large consumption of fresh methanol, high equipment investment, complicated operation process and the like

Pending Publication Date: 2022-03-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The patents that have been published at present mostly focus on the basic operation process of ethylene-vinyl acetate copolymer production and preparation or are only limited to laboratory research, and for the alcoholysis of ethylene-vinyl acetate copolymer to prepare ethylene-vinyl acetate copolymer There are few reports on industrial production methods and devices, and the consumption of fresh methanol is too large, the investment in equipment is high, and the operation process is complicated. The new process and new device of the material solve this problem in a targeted manner, can be used for guidance and are very easy to realize industrial production

Method used

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  • Method and device for preparing ethylene-vinyl acetate-vinyl alcohol copolymer
  • Method and device for preparing ethylene-vinyl acetate-vinyl alcohol copolymer
  • Method and device for preparing ethylene-vinyl acetate-vinyl alcohol copolymer

Examples

Experimental program
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Effect test

Embodiment 1

[0099] The technological process of this embodiment is as figure 1 Shown, wherein, alcoholysis tower I and alcoholysis tower II are tray towers.

[0100] In weight percentage, the polymer liquid stream of ethylene-vinyl acetate copolymer contains: 70wt% methanol, 30wt% ethylene-vinyl acetate copolymer, the temperature is 55°C, and the pressure is 0.6MPaG.

[0101] In terms of weight percentage, the concentration of sodium hydroxide lye is 5wt%, and the temperature is 25°C.

[0102] The alcoholysis tower I operating pressure is 0.32MPaG, and the alcoholysis tower I top condensate does not reflux.

[0103] The operating pressure of alcoholysis tower II is 0.57MPaG.

[0104] Alcoholysis tower I consumes fresh methanol vapor stream 103 as 0t / h, and alcoholysis tower II consumes fresh methanol vapor stream 112 as 20t / h, then the degree of alcoholysis of the ethylene-vinyl acetate alcohol copolymer polymer solution in alcoholysis tower I can reach 98.53%, the methyl acetate conte...

Embodiment 2

[0106] Embodiment is the same as embodiment 1, and difference is that alcoholysis tower I consumes fresh methanol vapor stream 103 and is 0t / h, and alcoholysis tower II consumes fresh methanol vapor stream 112 and is 25t / h, then the ethylene-vinyl acetate of alcoholysis tower I The degree of alcoholysis of the alcohol copolymer polymerization liquid can reach 98.63%, and the methyl acetate content of 110% in the tower still stream is 1990ppm. The methyl acetate content is 77ppm, and the molecular weight distribution of the ethylene-vinyl acetate copolymer product is 2.56.

Embodiment 3

[0108] Embodiment is the same as embodiment 1, and difference is that alcoholysis tower I consumes fresh methanol vapor stream 103 and is 0t / h, and alcoholysis tower II consumes fresh methanol vapor stream 112 and is 30t / h, then the ethylene-vinyl acetate of alcoholysis tower I The degree of alcoholysis of the alcohol copolymer polymerization solution can reach 98.71%, and the content of methyl acetate in the column stream 110 is 1905ppm. The methyl acetate content is 48ppm, and the molecular weight distribution of the ethylene-vinyl acetate alcohol copolymer product is 2.25.

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Abstract

The invention discloses a method and a device for preparing an ethylene-vinyl acetate-vinyl alcohol copolymer. The method comprises the following steps: feeding a polymerization liquid containing the ethylene-vinyl acetate copolymer into the upper part of an alcoholysis tower I, feeding a basic catalyst material flow into the alcoholysis tower I, or mixing a basic catalyst and the polymerization liquid containing the ethylene-vinyl acetate copolymer, feeding the mixture into the upper part of the alcoholysis tower I, blowing methanol steam into the bottom of the alcoholysis tower I, and reacting; feeding tower bottoms of the alcoholysis tower I into the upper part of an alcoholysis tower II, feeding a basic catalyst material flow into the alcoholysis tower II, and blowing excessive fresh methanol steam into the bottom of the alcoholysis tower II for reaction; a gas-phase material flow obtained by the reaction is discharged from the tower top as tower top gas of the alcoholysis tower II and is completely introduced into the bottom of the alcoholysis tower I to serve as a main source of methanol steam, and the ethylene-vinyl acetate-vinyl alcohol copolymer is obtained after tower bottom liquid of the alcoholysis tower II is discharged. The method has the advantages of low process energy consumption, small molecular weight distribution index of the resin product, low equipment investment cost and the like.

Description

technical field [0001] The invention relates to the field of ethylene-vinyl acetate copolymers, in particular to a method and a device for preparing ethylene-vinyl acetate copolymers. Background technique [0002] Ethylene-vinyl acetate copolymer (EVOH), polyvinylidene chloride (PVDC) and polyamide (PA) are known as the world's three major high-barrier materials. It is a kind of processing performance of ethylene polymer and vinyl alcohol polymer A new type of polymer synthetic material with excellent gas barrier properties is widely used in the packaging field and has a very broad market and application prospects. Ethylene-vinyl acetate copolymers can generally be polymerized from ethylene and vinyl acetate by conventional methods such as emulsion polymerization, solution polymerization, bulk polymerization or suspension polymerization to form ethylene-vinyl acetate copolymer (EVAC), and then undergo alcoholysis with a basic catalyst And prepared, the ratio is usually ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/00C08F210/02C08F218/08
CPCC08F8/00C08F210/02C08F218/08
Inventor 毕丰雷胡帅
Owner CHINA PETROLEUM & CHEM CORP
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