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Method for preparing disproportionated rosin with high dehydroabietic acid content

A technology of disproportionated rosin and dehydroabietic acid, which is applied in the field of rosin processing, can solve the problems of high energy consumption, light color of disproportionated rosin, and the need for distillation, etc., and achieve the effects of high content of dehydroabietic acid, increased added value, and simple steps

Active Publication Date: 2021-11-16
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The Chinese invention patent with the notification number CN1317348C discloses a method for the simultaneous manufacture of light-colored disproportionated rosin with high content of dehydroabietic acid and p-cymene. The resin acid is dissolved in a solvent and then disproportionated, and then distillation is required to obtain disproportionated rosin and other Product, the advantage of doing this is that the color of disproportionated rosin is light, and p-cymene can be obtained, but the disadvantage is that it needs to be distilled and consumes a lot of energy

Method used

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  • Method for preparing disproportionated rosin with high dehydroabietic acid content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put the turpentine into the turpentine tank after crushing, add tap water until the water surface is 10cm above the turpentine surface for maintenance, send the turpentine in the resin storage tank to the dissolving kettle when dissolving, add turpentine to make the oily quality of the clarified fat liquid reach 32%, add the quality of turpentine 8% water with a temperature of 80°C, adding 0.18% oxalic acid in the mass of turpentine, passing through water vapor, heating at 94°C, mixing and dissolving, filtering and clarifying to obtain a clear fat liquid;

[0028] The clarified fat liquid is naturally aged for 30 days, after the natural crystallization of crude resin acid crystals, the crude resin acid crystals are obtained by filtration, and the crude resin acid crystals are dissolved with absolute ethanol with a solid-to-liquid ratio of 1:1 (g / mL), and then Water is added, the volume ratio of water to ethanol is 3:10, the temperature is controlled at 0°C, and the time ...

Embodiment 2

[0031] Put the turpentine into the turpentine tank after crushing, add tap water until the water surface exceeds the rosin surface by 20cm for maintenance, send the turpentine in the tank to the dissolving kettle when dissolving, add turpentine to make the oily quality of the clarified fat liquid reach 36%, add the quality of turpentine 15% of water at a temperature of 90°C, adding 0.2% oxalic acid in the mass of turpentine, passing through water vapor, heating at 95°C, mixing and dissolving, filtering and clarifying to obtain a clear fat liquid;

[0032] The clarified fat liquid is naturally aged for 60 days, after natural crystallization and thick resin acid crystals, filter out the thick resin acid crystals, dissolve the thick resin acid crystals with absolute ethanol with a solid-to-liquid ratio of 1:1.2 (g / mL), and then go to Add water, the volume ratio of water to ethanol is 1:2, the temperature is controlled at 0°C, and the time is 24h for recrystallization to obtain res...

Embodiment 3

[0035] Put the turpentine into the turpentine pool after crushing, add tap water until the water surface exceeds the rosin surface by 15cm for maintenance, send the turpentine in the rosin pool to the dissolving kettle when dissolving, add turpentine to make the oily quality of the clarified fat liquid reach 34%, add the turpentine quality 10% water with a temperature of 85°C, adding 0.15% oxalic acid in the mass of turpentine, passing through water vapor, heating at 94°C, mixing and dissolving, filtering and clarifying to obtain a clear fat liquid;

[0036] Put the clarified fat liquid naturally for 40 days, after natural crystallization and precipitation of crude resin acid crystals, filter to obtain crude resin acid crystals, and dehydrated alcohol dissolves the crude resin acid crystals with a solid-to-liquid ratio of 1:1.2 (g / mL), and then pour them into Add water, the volume ratio of water to ethanol is 2:5, the temperature is controlled at 10°C, and the time is 12h for r...

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Abstract

The invention provides a method for preparing disproportionated rosin with high dehydroabietic acid content, and belongs to a rosin processing method. The method comprises the following steps of: preparing clear rosin liquid from rosin, standing and crystallizing the rosin liquid, and filtering to obtain a crystal, namely crude resin acid; dissolving the crude resin acid with ethanol, adding water, and recrystallizing to obtain resin acid; taking the resin acid as a raw material, adding a catalyst into the resin acid in a molten state, and carrying out a disproportionation reaction; and after the reaction is finished, filtering and separating to obtain a disproportionated rosin product. According to the method, resin acid obtained by crystallization and separation of the rosin liquid is directly melted and disproportionated to obtain disproportionated rosin, so that a distillation step is omitted, and more energy is saved; and the content of dehydroabietic acid in the obtained product is higher, especially the softening point and the acid value are higher, and the product has higher utilization value.

Description

technical field [0001] The invention belongs to a method for processing rosin, in particular to a method for preparing disproportionated rosin with high dehydroabietic acid content. Background technique [0002] China is a major producer of rosin, and the output of gum rosin ranks first in the world. Disproportionated rosin is produced by the catalytic disproportionation reaction of rosin, and it is one of the varieties with the largest output among modified rosin products. Disproportionated rosin is the conjugated double bond of abietic acid-type resin acid. Under the action of a catalyst, a disproportionation reaction occurs under a certain temperature and pressure to remove a molecule of hydrogen to form dehydroabietic acid with a stable structure of benzene ring, that is, dehydroabietic acid. acid. The production of disproportionated rosin can be divided into melting method and solvent method according to different raw material processing methods. In addition to the m...

Claims

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Application Information

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IPC IPC(8): C09F1/02C09F1/04
CPCC09F1/02C09F1/04
Inventor 陈丛瑾黎跃吴涛梁丽萍胡华宇覃宇奔
Owner GUANGXI UNIV
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