Preparation method of cu-ag/la@hap catalyst and its catalytic oxidation of 1,2-propanediol to prepare lactic acid

A catalyst, propylene glycol technology, applied in the field of catalysis, can solve the problem of 1,2-propanediol market surplus and achieve high application value

Active Publication Date: 2022-05-20
JIANGSU UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main reasons are as follows: First, a large amount of glycerol is produced in the process of large-scale biodiesel production (the global biodiesel production was about 30 million tons in 2015, and the by-product glycerin was about 3 million tons), and the upstream biomass raw material of 1,2-propanediol is abundant. Second, at present, dimethyl carbonate is mainly produced by co-production of 1,2-propanediol and dimethyl carbonate by transesterification in China, and the expansion of dimethyl carbonate production has led to a large amount of 1,2-propanediol flooding into the market; Three, 1,2-propanediol is difficult to consume increasing 1,2-propanediol for traditional purposes such as organic solvents and unsaturated resin raw materials, and the problem of excess 1,2-propanediol market in my country is particularly prominent

Method used

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  • Preparation method of cu-ag/la@hap catalyst and its catalytic oxidation of 1,2-propanediol to prepare lactic acid
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  • Preparation method of cu-ag/la@hap catalyst and its catalytic oxidation of 1,2-propanediol to prepare lactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of metal lanthanum-doped HAP support La@HAP: 10mL Ca(NO 3 ) 2 (1mol / L), 10mL H 3 PO 4 (0.6mol / L) and 2mL La(NO 3 ) 3 ·6H 2 O (1mol / L) aqueous solution was added in the there-necked flask, after adding dropwise 25% ammoniacal liquor to adjust the pH of the solution to 10, reacted for 8 hours under stirring conditions, then transferred the gained solution to a polytetrafluoroethylene autoclave, The reaction was continued for 8 hours at 100°C. After the reaction, the obtained powder was washed and filtered several times with deionized water, and then dried in an oven at 100°C for 12 hours to obtain the La@HAP carrier.

[0028] (2) Preparation of Cu-Ag bimetallic nanoparticle colloid: 0.07g Cu(NO 3 ) 2 ·3H 2 O, 0.05g AgNO 3 Dissolve in 13mL of 1% polyvinyl alcohol solution, then add 30mL of 0.1mol / L NaBH 4 aqueous solution. After aging for 30 minutes at room temperature, the Cu-Ag bimetal nanoparticle colloid can be obtained.

[0029] (3) Prepar...

Embodiment 2

[0033]Steps (1) to (3) are the same as in Example 1, and step (4) only changes the concentration of 1,2-propanediol in Example 1 to 0.16mol / L, 0.48mol / L, and 0.64mol / L, and the resulting 1,2- The results of propylene glycol conversion and lactic acid selectivity are shown in Table 1. The results showed that with the increase of the concentration of 1,2-propanediol, the conversion rate decreased gradually, and the selectivity of lactic acid also decreased gradually.

[0034] The impact of different 1,2-propanediol concentrations on the conversion rate of the final raw material and the selectivity of the reaction product in table 1

[0035]

[0036]

Embodiment 3

[0038] Steps (1) to (3) are the same as in Example 1, and step (4) only changes the concentration of sodium hydroxide used in Example 1 to be 0.16mol / L, 0.32mol / L, and 0.64mol / L respectively. The obtained 1,2-propanediol conversion rate and lactic acid selectivity results are shown in Table 2. Result shows, along with the increase of sodium hydroxide concentration, 1,2-propanediol conversion rate increases gradually, is 0.48mol / L in sodium hydroxide concentration, and promptly sodium hydroxide concentration and 1,2-propanediol concentration ratio are 1.5: At 1, the conversion rate of 1,2-propanediol reached 91.1%, while the selectivity of lactic acid reached the highest 89.6%.

[0039] The impact of the different sodium hydroxide concentrations of table 2 on the conversion rate of final raw material and the selectivity of reaction product

[0040] Sodium hydroxide concentration (mol / L) 1,2-propanediol conversion rate (%) Lactic acid selectivity (%) 0.16 81.5...

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Abstract

The present invention relates to the preparation method of Cu-Ag / La@HAP catalyst and its catalytic oxidation of 1,2-propanediol to prepare lactic acid, in particular to the use of metal lanthanum-doped hydroxyapatite (HAP) to support Cu-Ag bimetallic nano-catalysts Cu‑Ag / La@HAP, applied to catalyze the oxidation of 1,2‑propanediol to prepare lactic acid, the catalyst shows good catalytic activity and product selectivity, and the prepared supported bimetallic nanocatalyst is uniformly dispersed and has good catalytic performance life.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a preparation method of a Cu-Ag / La@HAP catalyst and an application thereof to prepare lactic acid by catalytic oxidation of 1,2-propanediol. Background technique [0002] Lactic acid is usually used as a fine chemical in the preparation of medicines, cosmetics, food, etc., and its global annual demand reaches 150,000 tons. Moreover, lactic acid is mainly used as an important monomer for the synthesis of degradable and non-toxic polylactic acid and lactic acid ester, which has prompted an increase in the demand for lactic acid year by year. At present, the preparation methods of lactic acid mainly include traditional chemical method and fermentation method, and the raw materials for preparing lactic acid by chemical synthesis method are mainly acetaldehyde, hydrocyanic acid and concentrated sulfuric acid, which are easy to cause environmental pollution; the reaction rate of lactic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C07C59/08C07C51/235
CPCB01J23/894B01J35/0013C07C51/235C07C59/08
Inventor 王慧杰张颖超冯永海汤旭阳卢聪明
Owner JIANGSU UNIV
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