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Method for producing maleopimaric anhydride

A technology of maleopimaric anhydride and a production method, applied in the direction of organic chemistry, etc., can solve the problems of large investment in production equipment and complex production process, and achieve the effects of improving comprehensive economic benefits, reducing production costs, and simplifying production processes

Inactive Publication Date: 2010-06-23
ZHEJIANG FORESTRY ACAD
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  • Abstract
  • Description
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Problems solved by technology

[0006] The technical problem to be solved in the present invention is to directly use turpentine as raw material to produce pilopipine anhydride products, which overcomes the traditional complex production process of pipine anhydride and the shortcomings of large investment in production equipment. The used solvent turpentine for synthesis reaction and separation is non-toxic, No pollution, can be recycled after recycling

Method used

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  • Method for producing maleopimaric anhydride

Examples

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Embodiment 1

[0016] Example 1 (refer to the raw materials listed in Example 1 in the above table and their proportions by weight, reaction temperature and time parameter values):

[0017] In the reaction kettle, add 100 parts by weight of rosin, heat to melt, then add 13 parts by weight of maleic anhydride, continue to heat up to 180°C, and the reaction will stop for 2 hours. When the reactant is cooled to 100°C, add 300 Parts by weight of turpentine oil as a solvent, stir well and let stand for 6 hours, centrifuge to separate the upper solvent, leaving a light yellow precipitate, repeat the above process 3 times, add 300 parts by weight of new turpentine each time, and stir evenly and then stand still Let it stand for 6 hours, centrifuge the upper solvent, and finally recrystallize the light yellow precipitate left after three times of dissolution with 100 parts by weight of glacial acetic acid to obtain white crystals. Wash them with water for 2-3 times and dry at 100°C to obtain the purity....

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Abstract

The invention relates to a method for producing maleopimaric anhydride, which adopts pine resin as the raw material and utilizes self-contained turpentine as solvent. Resin acid and maleic anhydride which are changed into conjugated double bonds in the pine resin are heated to 180 to 200 DEG C, and then are separated after diene addition reaction is carried out for 2 to 4 hours, so as to obtain a white crystal, i.e. the product of maleopimaric anhydride. The method has the advantages that the production process of maleopimaric anhydride is simplified, so that the production cost is remarkably reduced; the solvents used for synthetic reaction and separation are the same solvent, i.e. the pine resin, which is non-toxic and pollution-free and can be repeatedly used after being recycled; maleopimaric anhydride is produced in the method, so that the successful solidification of epoxy resin can be realized; the prepared solidified product is superior to methyl tetrahydrophthalic anhydride in the aspect of heat resistance and strength; and simultaneously, the separated residual pine resin can be used as the raw material producing biomass fuel oil, so that the composite economic benefit is increased.

Description

Technical field [0001] The invention relates to a method for preparing maleopimaric anhydride from rosin. Background technique [0002] The main chemical composition of rosin is terpenoids, including monoterpenes, sesquiterpenes, resin acids and a small amount of their derivatives. The resin acid is the main component of rosin. It has a variety of mono-resin acid isomers containing two unsaturated double bonds. Among them, the conjugated double bond of levopimaric acid is on the same ring, and it can interact with horses at room temperature. Acid anhydride undergoes diene addition reaction, and other abietic acid resin acids in rosin, such as abietic acid, neoabietic acid, and long-leafic acid, are isomerized to levopimaric acid under heating, and can also interact with Malay The acid anhydride addition reaction gives the adduct. Therefore, when maleic anhydride is added to a balanced mixture containing a small amount of L-pimaric acid, the diene addition reaction can occur, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/77C08G59/42
Inventor 柏明娥
Owner ZHEJIANG FORESTRY ACAD
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