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Catalyst for synthesizing dimethyl carbonate and preparation method thereof

A technology of dimethyl carbonate and catalyst, applied in the field of catalyst for synthesizing dimethyl carbonate and its preparation field, can solve problems such as insufficient catalytic performance, achieve the effects of good activity and selectivity, simple operation of recovery process, and reduced use cost

Active Publication Date: 2019-09-20
滕州京腾鑫汇新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Overall, there are still various shortcomings in the catalytic performance of existing catalysts for the synthesis of dimethyl carbonate by transesterification, so it is urgent to develop a new generation of catalysts with better performance to provide support for the industrial production of dimethyl carbonate. more favorable support

Method used

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  • Catalyst for synthesizing dimethyl carbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062]Prepare 100 mL of mixed solution A of zinc nitrate and ferric nitrate with deionized water, wherein the molar ratio of zinc ions to aluminum ions is 2. Then prepare 100mL of sodium carbonate solution B. Under continuous stirring, add solutions A and B dropwise into the reactor; then add an appropriate amount of sodium hydroxide solution with a concentration of 2mol / L to keep the pH value during the precipitation process at 9.5; The product was aged overnight at 55° C. in the mother liquor; the precipitate was separated by filtration, washed several times with water, and dried at 100° C. for 12 hours to obtain the hydrotalcite-like precursor.

[0063] Account for 6.5wt% of catalyst weight by the active component in the final catalyst, Bi 2 o 3 : KOH (weight ratio) = 1:2 to prepare the impregnation solution of bismuth nitrate and potassium hydroxide, wherein the concentration of bismuth ions is 0.2mol / L, and the concentration of KOH is 0.5mol / L. The zinc aluminum hydrot...

Embodiment 2

[0065] Prepare 100 mL of mixed solution A of zinc nitrate and ferric nitrate with deionized water, wherein the molar ratio of zinc ions to aluminum ions is 4. Then prepare 100mL of sodium carbonate solution B. Under continuous stirring, add solutions A and B dropwise into the reactor; then add an appropriate amount of sodium hydroxide solution with a concentration of 2mol / L to keep the pH value during the precipitation process at 10.5; after the precipitation is complete, the precipitation The product was aged overnight at 65° C. in the mother liquor; the precipitate was separated by filtration, washed several times with water, and dried at 100° C. for 12 hours to obtain the hydrotalcite-like precursor.

[0066] Account for 9.5wt% of catalyst weight by active component in the final catalyst, Bi 2 o 3 : KOH (weight ratio) = 1:4 to prepare the impregnation solution of bismuth nitrate and potassium hydroxide, wherein the concentration of bismuth ions is 0.8mol / L, and the concen...

Embodiment 3

[0068] Prepare 100 mL of mixed solution A of zinc nitrate and ferric nitrate with deionized water, wherein the molar ratio of zinc ions to aluminum ions is 3. Then prepare 100mL of sodium carbonate solution B. Under continuous stirring, add solutions A and B dropwise into the reactor; then add an appropriate amount of sodium hydroxide solution with a concentration of 2mol / L to keep the pH value during the precipitation process at 10; The product was aged overnight at 60° C. in the mother liquor; the precipitate was separated by filtration, washed several times with water, and dried at 100° C. for 12 hours to obtain the hydrotalcite-like precursor.

[0069] Account for 7wt% of catalyst weight by the active component in the final catalyst, Bi 2 o 3 : KOH (weight ratio) = 1:3 to prepare the impregnation solution of bismuth nitrate and potassium hydroxide, wherein the concentration of bismuth ions is 0.5mol / L, and the concentration of KOH is 1.2mol / L. The zinc aluminum hydrotal...

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Abstract

The invention belongs to the field of catalysts, and in particular relates to a catalyst for synthesizing dimethyl carbonate and a preparation method thereof. The catalyst comprises 6-10wt% of active components and balance of a carrier, the active components are Bi2O3 and KOH, and the weight ratio of Bi2O3: KOH = 1: 2-4. The carrier is a zinc-iron composite metal oxide. In the invention, a hydrotalcite precursor of the carrier is produced by a coprecipitation method, and the active components bismuth oxide (Bi2O3) and potassium hydroxide (KOH) are directly loaded by wet impregnation without roasting, and then the catalyst is prepared by drying and roasting under appropriate conditions, so that ZnO and ZnFe2O4 in the prepared catalyst carrier have an appropriate proportion and interaction force, the active components are uniformly distributed, the interaction force between the active components and the carrier is moderate, and the catalyst as a whole has excellent low-temperature activity, stability and service life.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a catalyst for synthesizing dimethyl carbonate and a preparation method thereof. Background technique [0002] Dimethyl carbonate (DMC for short) is an environmentally friendly organic chemical raw material that has been widely used and meets the requirements of modern "clean technology" and has been widely valued in recent years. It is known as the "new building block" of organic synthesis. Because it contains methoxyl, carbonyl and carbonylmethyl in its molecule, it has low toxicity, high solubility, excellent environmental performance and good reactivity, and can replace highly toxic phosgene and dimethyl sulfate, and is widely used in carbonyl Chemical and methylating reagents, gasoline additives, raw materials for polycarbonate synthesis, paint solvents, lithium battery electrolytes and other fast-growing industries, with a broad market, are popular green chemicals in the chemical i...

Claims

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Application Information

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IPC IPC(8): B01J23/843B01J35/10B01J37/02B01J37/08B01J37/32C07C68/06C07C69/96
CPCB01J23/8437B01J23/002B01J37/0201B01J37/082B01J37/32C07C68/06B01J2523/00B01J35/61C07C69/96B01J2523/27B01J2523/54B01J2523/842
Inventor 王计奎
Owner 滕州京腾鑫汇新材料科技有限公司
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