Catalyst and preparation method for hydrogenation of acetic acid to ethanol

A catalyst and ethanol production technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, organic compounds, etc., can solve problems such as large heat release, operating rate less than 60%, price drop of acetic acid, etc., to achieve mild reaction conditions, The effect of solving the overcapacity of acetic acid

Active Publication Date: 2016-04-13
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the average operating rate of domestic acetic acid plants is less than 60%, and the production of acetic acid is relatively surplus, resulting in a continuous decline in the price of acetic acid. Therefore, it is urgent to develop downstream products of acetic acid and improve the industrial chain of the acetic acid industry.
[0006] The above-mentioned published results show that the application of supported Pt catalyst in the hydrogenation of acetic acid shows good catalytic performance, but the loading of Pt is still high, reaching more than 0.5%, and the preparation method is mainly based on the conventional impregnation method , in view of the large heat release during the hydrogenation reaction of acetic acid, resulting in a short catalyst life, optimizing the catalyst preparation method and selecting a good support and additives will further improve the interaction between the metal and the support, improve the hydrogenation activity and thermal stability of the catalyst sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084](1) Add 54.45g of basic cobalt carbonate, 6g of molybdenum oxide, 14.89g of 85% phosphoric acid, and 5.18g of potassium nitrate into 100mL of deionized water, heat and dissolve at 100°C for 4 hours under constant stirring, and obtain clear and transparent Co-Mo-P-K mixture;

[0085] (2) Dissolving 128.2g of magnesium nitrate in the solution obtained in step (1) to form a Co-Mo-P-K-Mg mixed solution;

[0086] (3) After mixing 142g of silicon dioxide powder and 10g of scallop powder evenly, add the Co-Mo-P-K-Mg mixed solution prepared in step (2), knead and shape, dry at 120°C and roast at 400°C 4h, make catalyst precursor;

[0087] (4) Dissolve 2.66g of chloroplatinic acid in 100mL of deionized water, then put 200g of the catalyst precursor prepared in step (5) into the chloroplatinic acid solution for 2h, filter and dry at 200°C to obtain the catalyst. It is recorded as catalyst H, wherein the contents of Pt, Co, Mo, P, and K are 0.5%, 15%, 2%, 2%, and 1%, respectively...

Embodiment 2

[0089] (1) Add 54.45g of basic cobalt carbonate, 6g of molybdenum oxide, 14.89g of 85% phosphoric acid, and 5.18g of potassium nitrate into 100mL of deionized water, heat and dissolve at 100°C for 4 hours under constant stirring, and obtain clear and transparent Co-Mo-P-K mixture;

[0090] (2) Dissolving 128.2g of magnesium nitrate in the solution described in step (1) to form a Co-Mo-P-K-Mg mixed solution;

[0091] (3) Add the mixed solution prepared in step (2) to the silica sol (473.3g, containing 30% SiO 2 )-ammonia water (40mL) mixed solution, adjust the pH value of the solution to 5-6, continue to stir for 1h after the dropwise addition is complete, and let the precipitate age for 2h;

[0092] (4) Filter and wash the filter cake with deionized water until the conductivity of the washing solution is 10-100 μS / cm;

[0093] (5) Add 10g of squat powder to the filter cake, mix evenly, add 200mL of 5% dilute nitric acid solution, stir and form, dry at 120°C, and roast at 400...

Embodiment 3

[0096] (1) Add 54.45g of basic cobalt carbonate, 6g of molybdenum oxide, 14.89g of 85% phosphoric acid, and 5.18g of potassium nitrate into 100mL of deionized water, heat and dissolve at 100°C for 4 hours under constant stirring, and obtain clear and transparent Co-Mo-P-K mixture;

[0097] (2) Dissolving 128.2g of magnesium nitrate in the solution obtained in step (1) to form a Co-Mo-P-K-Mg mixed solution;

[0098] (3) After mixing 142g of silica powder and 10g of scallop powder evenly, add the Co-Mo-P-Mg mixed solution prepared in step (2), knead and shape, dry at 120°C and roast at 400°C 4h, make catalyst precursor;

[0099] (4) Dissolve 1.64g of platinum nitrate in 100mL of deionized water, then put 200g of the catalyst precursor prepared in step (5) into the platinum nitrate solution for 2h, filter and dry at 200°C to obtain the catalyst. It is recorded as catalyst J, wherein the content of Pt, Co, Mo, P, and K is 0.5%, 15%, 2%, 2%, and 1%, respectively, the content of c...

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PUM

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Abstract

The invention discloses a catalyst containing very low content of active components for the hydrogenation of acetic acid to produce ethanol, comprising active components, a first auxiliary agent, a second auxiliary agent, a third auxiliary agent, a fourth auxiliary agent and The carrier, based on the mass percentage of the catalyst, the ratio between the active component and the content of the four additives is 0.1-0.5:5-15:1-5:0.5-2:0.5-2, and the balance is the carrier. The invention also discloses two new preparation methods for the above-mentioned hydrogenation catalyst. The loading capacity of the active components of the catalyst provided by the invention is extremely low, while the reaction conditions of the catalyst are mild, and the conversion rate of acetic acid and the selectivity of ethanol can basically reach more than 98%, which is suitable for industrialization and is widely used in the hydrogenation of acetic acid to produce ethanol, and solves the problem of acetic acid production capacity surplus problem.

Description

technical field [0001] The invention relates to a hydrogenation catalyst, in particular to a catalyst used for direct hydrogenation of acetic acid to produce ethanol and a preparation method thereof. Background technique [0002] Ethanol has a wide range of uses and can be used to make beverages, flavors, dyes, fuels, etc. Ethanol with a volume fraction of 70%-75% is also commonly used as a disinfectant in medical treatment. Ethanol is a good solvent, which can dissolve many inorganic substances and many organic substances. Ethanol is also commonly used as a reaction solvent to dissolve both organic and inorganic substances participating in the reaction, increase the contact area, and increase the reaction rate. At present, my country's industry mainly produces ethanol through the fermentation of corn, cassava and other grains, and enterprises can only passively bear the losses caused by rising grain prices. Therefore, considering that ethanol production is subject to flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J23/652C07C31/08C07C29/149
Inventor 赵国强陈耀壮赖崇伟王莉应理
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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