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Vinyl acetate synthesis method

A technology of vinyl acetate and diethylene acetate, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylic acid esters, etc., can solve the problems of low vinyl acetate yield and low selectivity, and achieve improved activity and Stability, yield enhancement and selectivity effects

Active Publication Date: 2016-05-18
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 the problem of low vinyl acetate yield and low selectivity, and a new method for vinyl acetate synthesis is provided, which has the characteristics of high vinyl acetate yield and high selectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of carbonylation catalyst: RhCl containing 6.82gRh, 1.54gLi and 3.53gSn 3 ·3H 2 O, LiCl and Sn(NO 3 ) 2 Fully mix and dissolve in pure water to obtain 400ml of impregnation solution, and the specific surface of 1.0L is 168m 2 / g, spherical SiO with a pore volume of 0.94 and a diameter of 5.6mm 2 The carrier was immersed in the above impregnating solution, left to stand for 3 hours and dried at 100° C. to obtain the catalyst. The carbonylation catalyst was analyzed by ICP, and the Rh content was 6.82g / L, the Li content was 1.54g / L, and the Sn content was 3.53g / L.

[0028] Synthesis of vinyl acetate:

[0029]Step (1): Add 1.5 mol of acetic acid, 0.05 mol of carbonylation catalyst, 0.10 mol of methyl iodide and 0.45 mol of methyl acetate into a 500ml titanium reactor, first use argon to discharge the air in the reactor and pressurize to 2.0MPa, then Introduce carbon monoxide and hydrogen until the pressure is 6.8MPa, increase the stirring speed to 1200rpm...

Embodiment 2

[0034] Preparation of carbonylation catalyst: the RhCl containing 6.82gRh, containing 1.54gLi and containing 3.53gBi 3 ·3H 2 O, LiCl, and BiCl 3 Fully mix and dissolve in an aqueous hydrochloric acid solution with a concentration of 8wt%, to obtain 400ml of impregnation solution, and the specific surface of 1.0L is 168m 2 / g, spherical SiO with a pore volume of 0.94 and a diameter of 5.6mm 2 The carrier was immersed in the above impregnating solution, left to stand for 3 hours and dried at 100° C. to obtain the catalyst. The carbonylation catalyst was analyzed by ICP, and the Rh content was 6.82g / L, the Li content was 1.54g / L, and the Bi content was 3.53g / L.

[0035] Synthesis of vinyl acetate:

[0036] Step (1): Add 1.5 mol of acetic acid, 0.05 mol of carbonylation catalyst, 0.10 mol of methyl iodide and 0.45 mol of methyl acetate into a 500ml titanium reactor, first use argon to discharge the air in the reactor and pressurize to 2.0MPa, then Introduce carbon monoxide an...

Embodiment 3

[0050] The preparation of carbonylation catalyst: the Rh(OAc) that contains 10.00gRh, contains 2.00gK and contains 5.00gSn 3 、K 2 SO 4 and SnCl 2 2H 2 O is fully mixed and dissolved in a concentration of 10wt% acetic acid aqueous solution to obtain 400ml of impregnation solution, and the specific surface of 1.0L is 200m 2 / g, spherical Al with a pore volume of 1.00 and a diameter of 5.6 mm 2 o 3 The carrier was immersed in the above impregnating solution, left to stand for 3 hours and dried at 120° C. to obtain the catalyst. The carbonylation catalyst was analyzed by ICP, and the Rh content was 10.00 g / L, the K content was 2.00 g / L, and the Sn content was 5.00 g / L.

[0051] Synthesis of vinyl acetate:

[0052] Step (1): Add 1.5 mol of acetic acid, 0.05 mol of carbonylation catalyst, 0.10 mol of methyl iodide and 0.45 mol of methyl acetate into a 500ml titanium reactor, first use argon to discharge the air in the reactor and pressurize to 2.0MPa, then Introduce carbon m...

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Abstract

The invention relates to a vinyl acetate synthesis method. When vinyl acetate is prepared from methyl acetate through the route of carbonylation and cracking, vinyl acetate yield and selectivity are low. The invention mainly aims at solving the problems. The vinyl acetate synthesis method comprises the following steps: methyl acetate carbonylation is carried out, such that ethylene diacetate is obtained; and ethylene diacetate is cracked, such that vinyl acetate is obtained. A carbonylation catalyst adopts SiO2, Al2O3 or a mixture thereof as a carrier, and has active components comprising rhodium, alkali metal and at least one metal element selected from IVA and VA. With the technical scheme, the technical problem is well solved. The method can be used in industrial production of vinyl acetate.

Description

technical field [0001] The present invention relates to a process for the synthesis of vinyl acetate. Background technique [0002] Vinyl acetate (vinylacetate, VAC or VAM for short), is a colorless, transparent, flammable liquid at room temperature with a sweet ether fragrance. It is one of the most productive organic chemical raw materials in the world, widely used in the production of polyvinyl acetate (PVAc), polyvinyl alcohol, coatings, pastes, adhesives, vinylon, films, vinyl copolymer resins, acetal resins A series of chemical and chemical fiber products are widely used in various industries. [0003] The production of vinyl acetate adopts ethylene gas-phase method and acetylene gas-phase method both at home and abroad, which belong to the petrochemical process route. Since the rise of C1 chemistry, in the 1980s, the American Halcon (Halcon) company and the British Petroleum (BP) company successively A new process for the production of vinyl acetate from methanol an...

Claims

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Application Information

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IPC IPC(8): C07C69/15C07C67/297B01J23/644B01J23/62
Inventor 李建查晓钟杨运信
Owner CHINA PETROLEUM & CHEM CORP
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