Preparation of acrylic acid

A technology of acrylic acid and lactic acid, which is applied in the chemical industry to achieve the effects of low production cost, low environmental pollution and strong practicability

Inactive Publication Date: 2008-10-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent is a method for preparing acrylic acid through direct dehydration reaction using lactic acid obtained from fermentation of biomass raw materials as raw material and modified NaY molecular sieve as catalyst. This process route has not been reported in the literature yet.

Method used

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  • Preparation of acrylic acid

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Effect test

Embodiment 1

[0021] Put 1.2g of 30-50 mesh NaY catalyst into the constant temperature section of the tubular fixed-bed reactor, and fill the rest with quartz sand. After the system checks the seal, when the volumetric space velocity is 3h -1 N 2 The temperature of the catalytic bed was raised to 400°C under the gas flow rate, and the 10% ammonia water was mixed with a volume space velocity of 1.5h -1 After feeding the catalyst for 2 hours, keep the high temperature for 0.5 hours, then lower the temperature to 350°C, then inject 38% lactic acid solution into the system, and react through the catalytic bed after gasification. The reaction mixture is cooled by an ice-water bath and separated from gas and liquid. , the gas was evacuated, and the liquid collected after 1.5 hours of reaction was sampled for analysis, and the results are shown in Table 1.

Embodiment 2

[0023] Put 1.2g of 30-50 mesh NaY catalyst into the constant temperature section of the tubular fixed-bed reactor, and fill the rest with quartz sand. After the system checks the seal, when the volumetric space velocity is 3h -1 N 2 Under the gas flow rate, the temperature of the catalytic bed layer was raised to 500°C, and 3% ammonia water was added at a volumetric space velocity of 2h -1 After feeding the catalyst for 2 hours, keep the high temperature for 0.5 hours, then lower the temperature to 300°C, then inject 18% lactic acid solution into the system, and react through the catalytic bed after gasification. The reaction mixture is cooled by an ice-water bath and separated from gas and liquid. , the gas was evacuated, and the liquid sample collected after 1.5 hours of reaction was analyzed, and the results are shown in Table 1.

Embodiment 3

[0025] Put 1.2g of 30-50 mesh NaY catalyst into the constant temperature section of the tubular fixed-bed reactor, and fill the rest with quartz sand. After the system checks the seal, when the volumetric space velocity is 4h -1 N 2 Under the gas flow rate, the temperature of the catalytic bed layer was raised to 600°C, and 30% ammonia water was added at a volumetric space velocity of 1h -1 After feeding the catalyst for 2 hours, keep the high temperature for 0.5 hours, then lower the temperature to 420°C, then inject 38% lactic acid solution into the system, and react through the catalytic bed after gasification. The reaction mixture is cooled by an ice-water bath and separated from gas and liquid. , the gas was evacuated, and the liquid sample collected after 1.5 hours of reaction was analyzed, and the results are shown in Table 1.

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Abstract

The invention discloses a method for preparing acrylic acid, which takes lactic acid as material and modified NaY zeolite as activator to directly prepare acrylic acid through dehydration reaction. The procedure is as follow: the activator is encased at the constant-temperature segment of a fixed bed reactor; the fixed bed with the activator is heated to 300-450 DEG C under the protection of N2; the reactant lactic acid solution is added into the reactor; after aerification, the reactant lactic acid solution reacts at the fixed bed with the activator; the mixture after reaction is cooled and separated, obtaining acrylic acid. The reaction of the method is simple in operation, low in cost, with little pollution to the environment; therefore the method is a new method that satisfies industrial needs and is strongly practical.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a new method for preparing acrylic acid from biomass raw materials. Background technique [0002] Acrylic acid is an important class of organic synthetic monomers, widely used in chemical fiber, textile, adhesives, coatings, plastics, leather and other industries. In the past 10 years, the market of acrylic acid and its esters in my country has developed rapidly driven by the fields of construction, textiles, packaging and sanitary materials, while the domestic self-sufficiency rate has been declining year by year, so the contradiction between supply and demand of acrylic acid will be relatively tense. The traditional acrylic acid industry is completely based on the petrochemical industry. These routes are all based on petrochemical products to synthesize acrylic acid, such as the early cyanohydrin method (Germany Rohm & Hass Company, 1937), the improved Reppe method (Rohm & Ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C57/04C07C51/347B01J29/08
Inventor 黄和王红娟施海峰汪洋闫婕胡耀池
Owner NANJING UNIV OF TECH
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