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Method for producing lactic acid by using glycerin and special catalyst for production of lactic acid by using glycerin

A catalyst, lactic acid technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of high equipment requirements, increased equipment investment costs, high water heat stress and other issues

Active Publication Date: 2010-04-21
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that the temperature required for the reaction process is high, and it needs to withstand high hydrothermal pressure, which puts forward strict requirements on the production equipment.
The problem that this method exists is: (1) needs to use a large amount of H in the reaction 2 As a reaction raw material, while H 2 It is a very important energy source, its source is limited, its cost is high, and it is not easy to store and transport; Avoid avoiding equipment corrosion, increasing equipment investment costs, and unsafe operation process
However, the selectivity of lactic acid obtained by this method is still low, the full conversion and utilization efficiency of glycerol is not high, and the cost of separating the product is also high.

Method used

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  • Method for producing lactic acid by using glycerin and special catalyst for production of lactic acid by using glycerin
  • Method for producing lactic acid by using glycerin and special catalyst for production of lactic acid by using glycerin
  • Method for producing lactic acid by using glycerin and special catalyst for production of lactic acid by using glycerin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1, impregnation method prepares ZrO 2 Supported Pt-Pd Bimetallic Catalysts

[0063] Solution A (15mL): the solute is H 2 PtCl 6 ·6H 2 O, the solvent is water; the mass percentage composition of Pt is 0.5% in the solution A; contains 0.075g Pt in the solution A;

[0064] Solution B (15mL): the solute is PdCl 2 , the solvent is HCl aqueous solution (the mass percentage of HCl is 10%); the mass percentage of Pd in ​​the solution B is 0.75%; the solution B contains 0.1125g of Pd.

[0065] Mix solution A with solution B, add 5g ZrO 2 Carrier (Xilong Chemical Factory, Shantou City; batch number 060414); stirred at 30°C for 2h, dried, and then reduced at 200°C for 3h under a hydrogen atmosphere to obtain 2 Pt-Pd bimetallic supported catalysts (Pt-Pd / ZrO 2 ).

[0066] Characterized by plasma emission spectrometry (ICP), it was analyzed that the mass percentage of Pt loaded on the surface was 1.485%, and the mass percentage of Pd loaded on the surface was 2.24...

Embodiment 2

[0067] Embodiment 2, impregnation method prepares the Pt-Pd bimetallic catalyst supported by activated carbon

[0068] Solution A (20mL): the solute is H 2 PtCl 6 ·6H 2 O, solvent is water; The mass percentage composition of Pt is 0.5% in the solution A; Contain 0.1g Pt in the solution A;

[0069] Solution B (20mL): the solute is PdCl 2 , the solvent is HCl aqueous solution (the mass percentage of HCl is 10%); the mass percentage of Pd in ​​the solution B is 0.75%; the solution B contains 0.15g Pd.

[0070] Solution A was mixed with solution B, and 3 g of activated carbon carrier (Shanghai Activated Carbon Factory Co., Ltd.; batch number 0255436) was added thereto; stirred at 30° C. for 2 h, dried, and then reduced at 200° C. for 3 h under a hydrogen atmosphere. A Pt-Pd bimetallic supported catalyst (Pt-Pd / activated carbon) supported on activated carbon was obtained.

[0071] Characterized by plasma emission spectrometry (ICP), it was analyzed that the mass percentage of ...

Embodiment 3

[0072] Embodiment 3, coprecipitation method prepares Fe 2 o 3 Supported Pt-Rh Bimetallic Catalysts

[0073] Solution A: 20g Fe(NO 3 ) 3 9H 2 O dissolved in 150mL water, and 10mL H 2 PtCl 6 ·6H 2 O aqueous solution (the mass percent content of Pt is 0.5%) and 15mL RhCl 3 ·3H 2 O aqueous solution (mass percentage composition of Rh is 1%) is mixed, obtains solution A; In solution A, contains 0.05g Pt, 0.15g Rh;

[0074] Solution B: 40g NaOH was dissolved in 100mL water to obtain solution B.

[0075]At the same time, solution A and solution B were added dropwise into 200mL of water by means of co-current dropwise addition, during which the NaOH drop rate was adjusted to control the pH value to 9, then stirred at 50°C for 4h, suction filtered and washed until there was no Cl in the filtrate - Detected, dried and reduced at 350°C for 4h under a hydrogen atmosphere. get loaded on Fe 2 o 3 Pt-Rh bimetallic catalyst (Pt-Rh / Fe 2 o 3 ).

[0076] Characterized by plasma em...

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PUM

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Abstract

The invention provides a method for producing lactic acid by using glycerin and a special catalyst for the production of the lactic acid by using the glycerin. The catalyst provided by the invention is obtained by loading 0.1 to 30 mass parts of an active ingredient onto 100 mass part of carrier, wherein active ingredient is (1) Pt or (2) a composite of Pt and other noble metals. The catalyst can be used in the production of the lactic acid by using the glycerin. In the presence of the catalyst of the invention, the glycerin can be converted into the lactic acid effectively under a mild reaction condition. The catalyst of the invention has the advantages of high activity and selectively, easy preparation, low price, easy industrialization, long service life, loss prevention and good application prospective.

Description

technical field [0001] The invention relates to a method for producing lactic acid by utilizing glycerin and a special catalyst thereof. Background technique [0002] In addition to being used in the production of spices and flavors, lactic acid is widely used in many industries such as brewing, food, pharmaceuticals, daily chemicals, aquaculture, leather, cigarettes, wool spinning and other industries. It is worth noting that the polylactic acid obtained by polymerizing lactic acid as a raw material is non-toxic and non-irritating. It is a polymer material with good biodegradability and biocompatibility, as well as good mechanical and physical properties. As "green plastic", it is expected to replace the current fossil resources-based polyvinyl chloride, polypropylene, polystyrene, polyester and other materials. Due to its good biodegradability and biocompatibility, At present, it has attracted extensive attention in the field of biomedicine. At present, the methods of in...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J23/89B01J23/66B01J23/42B01J23/46B01J37/02B01J37/03B01J37/16C07C59/08C07C51/235
Inventor 刘海超沈宜泓
Owner PEKING UNIV
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