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Method for producing acrylic acid from glycerin
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A technology of acrylic acid and glycerol, applied in chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc., can solve the problems of high equipment requirements, high cost of ionic liquid catalysts, and large investment.
Active Publication Date: 2021-06-22
CHINA PETROLEUM & CHEM CORP +1
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[0005] A large amount of glycerin dehydration to prepare acrolein has been reported, such as patent CN101070276A reported acidic molecular sieve as catalyst, 200-500 ℃, pressure 0.001-3.0MPa, liquid space velocity 0.1-100h -1 , the yield of acrylic acid can reach 70-80%, but the molecular sieve catalyst has the problem of poor high-temperature hydrothermal properties: patents CN102936189A, CN102942462A, using pyridine, imidazole and quaternary ammonium salt ionic liquid as catalysts, at a reaction temperature of 250-350 °C, the molar ratio of ionic liquid to glycerol is 0.1:100-1.5:100, acrolein is prepared from glycerin liquid phase dehydration, the conversion rate of glycerol is 100%, and the yield of product acrolein is 30.5-68.2%, but the ion The cost of liquid catalyst is high, and the production efficiency is not as high as that of fixed bed reactor.
Patent CN 105498845 A uses a supercritical CO 2 The CsPW / Zr-MCM-41 catalyst prepared in the environment, using this catalyst, the conversion rate of glycerin can reach 65.2-100%, and the selectivity of acrolein can reach 56.8-85.4%. However, supercritical conditions require high equipment and large investment
[0006] But the catalyst acrylic acid yield of prior art is on the low side
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Embodiment 1
[0066] Take 400ml of commercially available SiO 2 Carrier powder, 20g graphite, 40g deionized water, mixed evenly, pelletized, dried at 120°C, calcined at 500°C for 2 hours, prepared Raschig ring carrier particles.
[0067] 3.5g platinum tetrachloride (PtCl 4 ) was dissolved in 100g of water to obtain a platinum tetrachloride aqueous solution. Take 200ml of carrier particles, pour the platinum tetrachloride aqueous solution into it, stir thoroughly, dry at 120°C, and roast at 500°C for 2 hours to obtain a catalyst. The catalytic activity is shown in Table 1 .
Embodiment 2
[0069] Take 400ml of commercially available TiO 2 Carrier powder, 20g graphite, 40g deionized water, mixed evenly, pelletized, dried at 120°C, calcined at 500°C for 2 hours, prepared Raschig ring carrier particles.
[0070] 5.2g hydrated ruthenium trichloride (RuCl 3 ·3H 2 O) dissolved in 100g of water to obtain an aqueous solution of ruthenium trichloride, take 200ml of carrier particles, pour the aqueous solution of ruthenium trichloride into it, fully stir, dry at 120°C, and roast at 500°C for 2 hours to obtain a catalyst. The catalytic activity is shown in the table 1.
Embodiment 3
[0072] Take 400ml of commercially available niobium pentoxide carrier powder, 20g of graphite, and 40g of deionized water, mix them uniformly, punch into tablets, dry at 120°C, and roast at 500°C for 2 hours to prepare Raschig ring carrier particles.
[0073] 3.6g iridium trichloride hydrate (IrCl 3 ·3H 2 O) be dissolved in 100g of water to obtain iridium trichloride aqueous solution, take 200ml of carrier particles, pour the iridium trichloride aqueous solution into it, fully stir, dry at 120°C, and roast at 500°C for 2 hours to obtain the catalyst. The catalytic activity is shown in the table 1.
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Abstract
The invention relates to a method for producing acrylic acid from glycerin, which mainly solves the problem of low yield of acrylic acid in the process of synthesizing acrylic acid from glycerin in the prior art. The method for producing acrylic acid by using glycerin includes contacting the raw material containing glycerin and the raw material containing oxygen with a catalyst, glycerin A dehydration reaction occurs to generate acrolein, and acrolein is further oxidized to acrylic acid; the catalyst includes a carrier and an active component, and the active component includes at least one technical solution selected from Pt, Re and Rh, preferably The technical problem is solved, and the method can be used in the industrial production of acrylic acid synthesized from glycerin.
Description
technical field [0001] The present invention relates to a method for producing acrylic acid from glycerin. Background technique [0002] Acrylic acid (CH 2 =CH-COOH) is the simplest unsaturated carboxylic acid, which is an important organic synthesis raw material and synthetic resin monomer. Acrylic acid is mainly used to synthesize advanced water-absorbent resins and water treatment agents, etc., and a part of acrylic acid is used for esterification to manufacture acrylates such as methyl acrylate, ethyl acrylate, n-butyl acrylate and 2-ethylhexyl acrylate, while Acrylate polymers are mainly used in adhesives, coatings, textiles, plastics, leather, paper and other fields. [0003] Acrylic acid and its series of products have developed rapidly in recent years. In 2015, the world's total output of acrylic acid and its esters reached 7.7 million t / a, an increase of about 27% compared with 6.07 million t / a at the end of 2013. At present, the production of acrylic acid The in...
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