Method for producing tetrahydro isomerized alpha acid

A technology of isomerization and products, applied in the production field of tetrahydroisomerization alpha acid, can solve the problems of low reuse times of precious metal catalysts, high production cost, poor solubility of tetrahydroisomerization alpha acid products, etc., and achieve Low production cost, improved purity, good solubility

Inactive Publication Date: 2006-03-08
YUMEN TUOPU SCI & TECH DEV CO LTD
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Problems solved by technology

[0004] The present invention proposes the technical scheme of the present invention in order to solve the problems of low reuse times of precious metal catalysts in the prior art, high production cost and poor solubility of the produced tetrahydroisomerization alpha acid product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Weigh 400 grams of supercritical carbon dioxide hop extract (which contains 41% of alpha acid and 39% of beta acid), add 1500 ml of 0.1% sodium hydroxide solution, heat to 55°C under nitrogen protection, and stir for 30 minutes , pour off the solution. Another 1500 ml of 1.2% sodium hydroxide solution was added, heated to 55° C. under nitrogen protection, stirred for 50 minutes, cooled to room temperature, and the clear solution was collected. If the solution is acidified, a creamy α-acid can be obtained with a content of 87% α-acid. In this example, the obtained α-acid solution was directly used in the next reaction.

[0032] (2) Carry out isomerization reaction, add K to the above-mentioned α acid solution 2 CO 3 , adjust the pH value of the solution to 10.5, add 14 grams of magnesium chloride hexahydrate, under the protection of nitrogen, stir and heat to boiling, keep warm for 90 minutes, and cool to room temperature to obtain 145 grams of solid isomerization...

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Abstract

This invention relates to a preparation method for tetrahydro-iso-alpha acid. First, clean hop extractive with weak lye. Then, dissolve the alpha acid therein with higher concentration lye and isomerize it into isomerized alpha acid by routine isomerization method. Next, with skeleton metal catalyser and bivalent and trivalent metal ion as protectant, hydrogenize the isomerized alpha acid to obtain the tetrahydro-iso-alpha acid which is treated by kali-salt strong acidic cationic-exchanged resin to obtain the end product. Advantages: low cost and good solubleness.

Description

technical field [0001] The invention relates to a method for producing tetrahydroisomerization alpha acid, more specifically, the invention relates to a method for producing tetrahydroisomerization alpha acid by using Raney nickel, lacquer nickel, etc. as catalysts. Background technique [0002] Tetrahydroisomerized α-acid has fewer unstable double bonds than isomerized α-acid, so it is not easy to oxidize, which can reduce the TBA value of beer and improve the antioxidant capacity (RSV) of beer. [0003] There are many patents and documents related to the method for preparing tetrahydroisomerization alpha acid at home and abroad, such as US3552925, US4918240, US4644084, US5013571, US5523489, US5600012, US6198004, Chinese patent application 94100149.0, Chinese patent application 98120079.6 and journal documents (J.Agri. Foodchem.1991,39,1732-1734), etc., the methods in these documents have their own characteristics, but the catalysts used are Pd / C catalysts, which have the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/67C07C49/743
Inventor 刘启民马连清宋春影
Owner YUMEN TUOPU SCI & TECH DEV CO LTD
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