Technique for producing propenoic acid by dehydrating biomass lactic acid

A production process and technology of acrylic acid, applied in the field of chemical industry, can solve the problems of staying, no industrialized report, no acrylic acid process design research, etc., to meet the needs of industrialization and have the effect of strong practicability

Inactive Publication Date: 2008-09-03
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above research is only at the experimental stage, and there is no process design research on the catalytic dehydration of biomass lactic acid to acrylic acid, and there is no report on industrialization

Method used

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  • Technique for producing propenoic acid by dehydrating biomass lactic acid
  • Technique for producing propenoic acid by dehydrating biomass lactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) The lactic acid aqueous solution with a mass fraction of 50% is passed through the gas-liquid heat exchanger I1 to be vaporized to reach 180°C.

[0022] (2) Heat nitrogen to 180°C through heat exchanger II 2, and mix with lactic acid-water mixed steam. The mixed gas is heated to the required temperature of 350°C through heat exchanger III 3.

[0023] (3) The heated mixed gas enters the gas-solid catalytic reactor 6 for catalytic reaction and dehydration to obtain reaction product gas. Gas-solid catalytic reactor 6 adopts an isothermal tubular fixed-bed reactor with a tube diameter of 30mm and a length of 3000mm. The heating medium is molten salt. The catalyst uses 1.5kgK / Y molecular sieve, and the bulk density of the molecular sieve is 1.0g / ml , the catalytic reaction temperature is 350°C, and the mass space velocity of the raw material is 3.0h -1 , The reaction pressure is 1.5MPa. The production method of K / Y molecular sieve: 0.4532kgKNO 3 Mix it with 10kg NaY ...

Embodiment 2

[0029] (1) The gasification of the lactic acid aqueous solution with a mass fraction of 60% is coupled with the condensation of the product gas, that is, the lactic acid aqueous solution with a mass fraction of 60% directly passes through a gas-liquid heat exchanger with a product gas at a temperature of 350°C as a heat source I1 was heated to 160 °C.

[0030] (2) The nitrogen gas is heated to 160°C through the heat exchanger II 2 and mixed with the lactic acid-water mixed steam, and the mixed gas is heated to the required temperature of 250°C through the heat exchanger III 3.

[0031] (3) The heated mixed gas enters the gas-solid catalytic reactor 6 for catalytic reaction and dehydration to obtain reaction product gas. Gas-solid catalytic reactor 6 adopts an isothermal tubular fixed-bed reactor with a tube diameter of 30mm and a length of 3000mm. The heating medium is molten salt. The catalyst uses 1.5kgBa / Y molecular sieve, and the bulk density of the molecular sieve is 1.0g...

Embodiment 3

[0037] (1) The lactic acid aqueous solution with a mass fraction of 30% is passed through the gas-liquid heat exchanger I1 to be vaporized to reach 180°C.

[0038] (2) Carbon dioxide is heated to 200°C through heat exchanger II 2 and mixed with lactic acid-water mixed steam. The mixed gas is heated up to the required temperature of 450°C through heat exchanger III 3.

[0039] (3) The heated mixed gas enters the gas-solid catalytic reactor 6 for catalytic reaction and dehydration to obtain reaction product gas. The gas-solid catalytic reactor 6 is an adiabatic bed reactor, the catalyst is 1.5kg Ca / Y molecular sieve, the particle size of the molecular sieve is 70um, the catalytic reaction temperature is 450°C, and the reaction pressure is 0.1MPa. The production method of Ca / Y molecular sieve: 0.6587kgCa(NO 3 ) 2 Mix it with 10kg NaY molecular sieve in 20L of water, heat and stir at 80°C for 4h, dry in an oven at 100°C for 24h, put the dried powder in a muffle furnace and roas...

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Abstract

The invention a process for producing acrylic acid by biomass lactic acid dehydration, more particularly relates to a process for producing acrylic acid by using lactic acid obtained by biomass fermentation as raw material for catalytic dehydration. The method comprises heating up the lactic acid solution to gasify at 150-200 degree C, mixing the obtained mixed vapour of lactic acid and water with the carrier gas, entering into gas-solid catalytic reactor to get the reaction product gas by the action of a modified Y zeolite molecular sieve catalytic agent and dewatering after heating up the mixed gas to 200-450 degree C, obtaining the propenoic acid solution through gas-liquid dissociation after cooling the reaction product gas, obtaining coarse propenoic acid products form the propenoic acid solution by gas stripping, azeotropic distillation, extraction and rectification in turns. The invention provides a process for producing acrylic acid by biomass lactic acid dehydration for the first time, the process can be applied in the green catalytic production for producing acrylic acid by lactic acid dehydration, using modified Y zeolite molecular sieve as a catalytic agent, and the process is a new process which is strong in industrialized demand and practicability.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a process for dehydrating biomass lactic acid to produce acrylic acid. Background technique [0002] Acrylic acid (acrylic acid), also known as patinic acid, molecular formula C 3 h 4 o 2 . Acrylic acid is a colorless liquid at normal temperature and pressure, with a pungent odor, a relative density of 1.0511, a melting point of 12°C, and a boiling point of 141.6°C. It is soluble in water, ethanol and ether. It is chemically active and is a strong organic acid. It is corrosive. Acrylic acid and its ester series monomers are the most attractive monomers for synthetic polymers. Because of the unsaturated double bond structure at the carbonyl α and β positions, thousands of stable polymers with different characteristics can be produced by polymerization and cross-linking. Acrylic acid is mainly used to synthesize acrylate and polyacrylic acid, and polyacrylic acid can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C57/04C07C51/377B01J29/08
Inventor 黄和汪洋余定华闫婕王红娟孙鹏谢毓胜顾铭燕程明
Owner NANJING TECH UNIV
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