The method of preparation of nickel catalyst for hydrogenation of vegetable oils and fats

 

(57) Abstract:

The invention relates to the preparation of heterogeneous catalysts used in hydrogenation processes. The method of preparation of the catalyst is deposited on a carrier of Nickel salt and soda ash, which gradually poured to 10-15% increase of Nickel salt solution, followed by filtering, washing, drying, recovery in the hydrogen-containing gas and the passivation of nitrogen-air mixture. The deposition of lead from 20-80% suspension containing both salt of Nickel, and soda ash, in a molar ratio to the Nickel salts, equal to 1.0 to 1.5. The proposed method allows to increase the activity of the resulting catalyst in the process of hydrogenation of oils and fats by 30-40%. In addition, it simplifies the technology of deposition and reduced water consumption for washing the precipitated mass. table 1.

The invention relates to the preparation of heterogeneous catalysts used in hydrogenation processes.

Known method of preparing precipitated catalysts, including the dissolution of the original salt with subsequent sedimentation /1/.

A known method of producing catalyst for the hydrogenation of organellar with subsequent processing, includes stage filtration, washing, drying, calcination at 380-420oC, tabletting and recovery in an atmosphere of hydrogen containing gas /2/.

The disadvantage of this method is the low activity of the obtained catalyst and large water consumption when washing the precipitated mass of the catalyst, which entails the formation of wastewater containing heavy metal.

The closest technical solution of the essence and the achieved effect is a method for preparing a catalyst for hydrogenation of vegetable oils and fats by deposition of Nickel on a carrier of 10-12% aqueous solution of Nickel sulfate 30% sodium carbonate solution followed by washing, drying, recovery in the hydrogen-containing gas at 350-500oC and passivation of nitrogen-air mixture /3/. The soda ash solution is added to a solution of Nickel salts at stirring speeds of 10-20 ml/min

The disadvantage of this method is the low activity of the catalyst in the hydrogenation of unsaturated bonds in vegetable oils (50%).

In addition, in the cooking process produce large quantities of wastewater, and the catalyst contains impurities of neumuhlen to increase the activity of the Nickel catalyst in the hydrogenation of vegetable oils and fats and simplifying the technology of preparation of the catalyst.

This technical effect is achieved by deposition of a basic carbonate of Nickel on kieselguhr from a more concentrated solution of Nickel sulfate in the presence of sodium carbonate at a molar ratio of baking soda to the salt of Nickel, 1.0-,1,5.

The invention is illustrated by the following examples.

Example 1. Prepare 1 l of a suspension containing 60g salt: with NISO47H2O 400g, Nickel sulfate Na2CO3H and SiO274g.

For precipitation, the suspension is heated to 85oC and mix until reaching a pH of 9-10. The resulting mixture is poured into distilled water (1l) and decanted, and then filtered. The precipitate is washed from the ions SO-4-and Na+distilled water, dried, restore in hydrogen at 400-420oC for 2 hours, then Passepartout 5 hours in a nitrogen-air mixture at a temperature of not more than 100oC. the catalyst in the number 150g contains 55% Ni. The activity of this sample in the hydrogenation of sunflower oil is determined by the following method.

In a glass reactor placed 50g refined sunflower oil and 0.15 g of the catalyst fraction of 0.9 μm. Next raise temperature control for reducing the refractive index of the hydrogenated feed is cut compared to the original oil. The degree of saturation of the ethylene linkages mixture of triglycerides (A) determined by the formula:

< / BR>
where A degree of saturation,

P600the refractive index of the mixture of triglycerides at 60oC;

P6g0the refractive index of the hydrogenated feed is cut at 60oC;

1,4470 refractive index fully gidrirovannoe mixture of triglycerides (tristearin) at 60oC.

The degree of saturation of the received section of hydrogenated feed was 78.0%

The other catalyst samples were obtained by analogy with example 1. The test results of these samples in the hydrogenation of sunflower oil in the table.

As can be seen from the table, the inventive method of preparing a Nickel catalyst can increase the activity in the hydrogenation of vegetable oils and fats by 30-40%

When conducting a deposition under these conditions (at high concentration source of salts in solution) in the structure of the obtained basic Nickel carbonate ions are not introduced sulfate and sodium that allows about 10 times to reduce water consumption by washing the precipitated mass from these catalytic poisons.

In addition, the method allows to simplify the technology of USAID nerastvorim sodium carbonate.

The inventive method will be implemented in enterprises that produce nicelyslightly catalyst for hydrogenation of vegetable oils and fats (Ufa refinery and Novokuibyshevsk neftekhimkombinat).

The method of preparation of Nickel catalyst for hydrogenation of vegetable oils and fats by deposition on kieselguhr Nickel sulfate soda ash, followed by filtering, washing, drying, recovery in the hydrogen-containing gas and a passivation attivazione mixture, characterized in that the deposition of lead from 20 to 80% suspension containing both Nickel sulfate and soda ash in a molar ratio of soda sulphate of Nickel, 1.0 to 1.5.

 

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