Method for preparing polyoxymethylene dimethyl ether carboxylate and methyl methoxy acetate
A polymethoxydimethyl ether, carbonyl compound technology, applied in the direction of carbon monoxide or formate reaction preparation, organic chemistry, etc., can solve the problem that the conversion rate of methylal methoxyacetate is not ideal and the selectivity of methyl methoxyacetate is not ideal. Problems such as low aldehyde concentration and short catalyst life, to achieve the effect of high selectivity, long catalyst life and high conversion rate
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Embodiment 1
[0048] 50g of the acidic MCM-22 molecular sieve catalyst with a silicon-aluminum ratio (Si:Al)=40:1 was calcined at 550° C. for 5 hours under the air atmosphere of a muffle furnace, and a part of the powder samples were taken for tableting and pulverized into 20-40 meshes. for activity testing. Weigh 10g of the acidic MCM-22 molecular sieve catalyst sample, put it into a stainless steel reaction tube with an inner diameter of 8.5mm, activate it with nitrogen at normal pressure and 550°C for 4 hours, then drop it to the reaction temperature (T)=90°C, and pass it into Carbon monoxide: DMM: hydrogen (CO: DMM 2 :H 2 )=7:1:1, slowly increase the pressure to the reaction pressure (P)=10MPa, the mass space velocity of dipolyoxymethoxydimethyl ether (WHSV)=0.2h -1 , Analyze the product with gas chromatography, after the reaction is basically stable, calculate the conversion rate of dipolyoxymethylene dimethyl ether and the selectivity of polyoxymethylene dimethyl ether carbonylate, ...
Embodiment 2
[0050] The catalyst in Example 1 is replaced by an acidic ferrierite molecular sieve, Si: Al=10:1, T=60°C, CO:DMM 2 :H 2 =13:1:3, P=4MPa, WHSV=1.5h -1 , all the other experimental procedures are consistent with Example 1, and the reaction results are shown in Table 1.
Embodiment 3
[0052] The catalyst in Example 1 is replaced by acidic ZSM-5 molecular sieve, Si: Al=150:1, T=140°C, CO: DMM 2 :H 2 =2:1:5, P=6.5MPa, WHSV=3.0h -1 , all the other experimental procedures are consistent with Example 1, and the reaction results are shown in Table 1.
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