A method for synthesizing dialkyl carbonate from biomass-based synthesis gas

A technology for dialkyl carbonate and dimethyl carbonate is applied in the field of biomass-based synthesis gas to synthesize dialkyl carbonate, and can solve the problems of high corrosiveness of catalyst equipment, highly toxic dimethyl sulfate, and high operational safety requirements, Achieve the effect of scientific and environmentally friendly synthesis method, low production cost, and reduction of environmental pollution

Active Publication Date: 2021-03-26
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional industrial production of dimethyl carbonate generally adopts the phosgene synthesis method, but the synthesis can only maintain small-scale industrial production, and these preparation methods require phosgene, high operational safety requirements, and serious environmental pollution, so they are gradually replaced by the methanol oxidative carbonylation method replaced by
However, the methanol oxidative carbonylation method is divided into a liquid phase method and a gas phase method: in the reaction process of the liquid phase method, methanol is both a raw material and a solvent, and the oxygen concentration is always kept below the explosive limit in the reaction process. The catalyst is highly corrosive to the equipment, and the gas phase method requires a fixed-bed reactor. The disadvantage is that the catalyst activity is low
Imre Weisz once proposed to synthesize dimethyl carbonate by reacting dimethyl sulfate and sodium carbonate in a tank reactor, using chlorobenzene as a catalyst, and refluxing at 150-210°C for 6 hours to obtain dicarbonate with a yield of 44%. Methyl esters (WeiszI, Havelka F, Pellek Z, Dimethyl and diethyl carbonates, Hung Teljes, 1977, 14:221~226), but due to the low yield of this process, chlorobenzene and dimethyl sulfate are highly toxic, so the Law has not been further developed

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for synthesizing dialkyl carbonate from biomass-based synthesis gas
  • A method for synthesizing dialkyl carbonate from biomass-based synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Preparation of biomass-based syngas

[0028] Put 100g of wood chips made into pellets into the gasifier, first control the temperature of the drying layer of the gasifier to 200°C, and dry the wood chips for 2.5 hours; then adjust the temperature for pyrolysis layer temperature to 500°C, and then pyrolyze the wood chips 1.5h; finally, the sawdust enters the combustion layer at a temperature of 900°C, and the steam of the gasification agent is introduced into the combustion layer of the gasifier at a rate of 1g / min. The main components of syngas are: 35% H 2 , 38% CO, 11% CO 2 , 15%H 2 O.

[0029] The crude synthesis gas is reformed to H through a steam shift reaction unit 2 The molar ratio to CO is 1.4, iron is used as the catalyst, the pressure is 0.8MPa, and the reaction temperature is 250°C; then the gas is purified into a methanol solution at -53°C to absorb CO 2 , to collect syngas.

[0030] 2) Synthesis of dimethyl ether

[0031] The first is the prepara...

Embodiment 2

[0042] 1) Preparation of biomass-based syngas

[0043] Put 150g of wood chips made into pellets into the gasifier, first control the temperature of the drying layer of the gasifier to 180°C, and dry the wood chips for 2.5 hours; then adjust the temperature for pyrolysis layer temperature to 400°C, and then pyrolyze the wood chips 1.5h; finally, the sawdust enters the combustion layer at a temperature of 800°C, and the steam of the gasification agent is introduced into the combustion layer of the gasifier at a rate of 1.5g / min, and the gas from the gasification furnace is recovered to make biomass crude syngas The main components of crude synthesis gas are: 35% H 2 , 30% CO, 20% CO 2 , 15%H 2 O.

[0044] The crude synthesis gas is adjusted by the steam shift reactor to adjust the H 2 The ratio to CO is 1.3, iron is used as the catalyst, the pressure is 0.8MPa, and the reaction temperature is 250°C; then the gas is passed into the methanol solution at -53°C to absorb CO 2 ,...

Embodiment 3

[0057] 1) Preparation of biomass-based syngas

[0058] Put 120g of wood chips made into pellets into the gasifier, first control the temperature of the drying layer of the gasifier to 230°C, and dry the wood chips for 2.5 hours; then adjust the temperature for pyrolysis. The temperature of the layer is 550°C, and then pyrolyze the wood chips 1.5h; finally, the wood chips enter the combustion layer at a temperature of 850°C, and the steam of the gasification agent is introduced into the combustion layer of the gasifier at a rate of 1.2g / min, and the gas from the gasification furnace is recycled to make biomass crude syngas. The main components of crude synthesis gas are: 36%H 2 , 33% CO, 19% CO 2 , 12%H 2 O.

[0059] The crude synthesis gas is adjusted by the steam shift reactor to adjust the H 2 The ratio to CO is 1.5, iron is used as the catalyst, the pressure is 0.8MP a, and the reaction temperature is 250°C; then the gas is passed into the methanol solution at -53°C to ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to synthesis methods of ester compounds in organic chemistry and particularly relates to a method for synthesizing diakyl carbonate from biomass-based synthesis gas. Biomass-based synthesis gas obtained from biomass-based agricultural and forestry residues used as initial materials is further catalyzed to form dimethyl ether, the obtained dimethyl ether is further catalyzed to form dimethyl carbonate, then, dimethyl carbonate is subjected to transesterification with monohydric alcohol or polyhydric alcohol, and diakyl carbonate is obtained. According to the method, diakylcarbonate is produced from the cheap agricultural and forestry residues used as raw materials, the production cost is saved, environmental pollution is reduced, and a new way is provided for industrial production of diakyl carbonate and efficient and comprehensive utilization of agricultural and forestry residues, and the method has significant economic and social benefits.

Description

technical field [0001] The invention relates to a method for preparing dialkyl carbonate, in particular to a method for synthesizing dialkyl carbonate from biomass-based synthesis gas. Background technique [0002] Dialkyl carbonate is a non-toxic chemical raw material, because its molecule contains -CO, -COOCH 3 and -CH 3 , has good reactivity, can react with a variety of alcohols, phenols, amines and esters, is a widely used organic compound and a good solvent, there are many types of dialkyl carbonate, some can be used as fuel, and some can be used As lubricating oil, some can be used as biodiesel, so it has high industrial application value and good market prospect. Among them, dimethyl carbonate is the most representative organic compound, and its synthesis methods mainly include phosgene synthesis, oxidative carbonylation, and transesterification. [0003] The traditional industrial production of dimethyl carbonate generally adopts the phosgene synthesis method, but...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C07C68/06C10J3/02C07C69/96C10L1/02C10M105/48
CPCC07C41/01C07C68/06C10J3/02C10L1/02C10M105/48C10M2207/325C07C68/01C07C69/96C07C43/043Y02E50/30
Inventor 李学兵王忠李青洋
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap