Method for decolorization preparation of pale rosin by rosin containing non-decoloring agent

Abstract

The invention discloses a method used for preparing light-colored rosin by a rosin light-coloring way without adding decoloring agent, which is mainly characterized in that under the condition without the decoloring agent, colored composition in the rosin is decomposed by a thermo-chemical bleaching action, thus achieving the object of light-coloring decoloring of the rosin; namely, under the condition of protective gases such as nitrogen, and the like, the rosin keeps the temperature for a certain time at the temperature of 180-270 DEG C; after the reaction is finished, the rosin is cooled to the temperature below 180DEG C, and the light-colored rosin can be prepared by feeding. The color of the rosin prepared by the method is better than the raw material rosin; when being presented by Gardner color grade, the color of the product is shallower by 0.5-4 color grade than the initial color; the best color is equivalent to national standard special grade which is gained by lightening from national standard class 4; the light-colored rosin is not needed to be distilled in a high vacuum state, has simple and convenient operation, little energy consumption, low expense and high product yield, and has no adding of external additive composition; the gained light-colored rosin product is beneficial for the deep processing and utilization of the rosin, and is applicable to being directly taken as the raw material of various rosin resins.

Description

Technical field: [0001] The invention relates to the technical field of deep processing of rosin, in particular to a method for lightening rosin. Background technique: [0002] Rosin is an important natural and renewable basic chemical raw material, which can be divided into gum rosin, wood rosin and tall oil (tall oil) rosin according to different sources of raw materials. The main components of rosin are resin acids, mainly including abietic acid, palusaric acid, levopimaric acid, neoabietic acid, dehydroabietic acid, pimaric acid, isopimaric acid and Sandarpimaric acid. my country is a big rosin producer and a big rosin exporter. About half of rosin is exported as raw materials every year. The utilization rate of rosin deep processing is not high, and some rosin deep processing products are imported at high prices. In the same period, developed countries almost 100 % use rosin reprocessing or deep processing products. The deep processing and utilization of rosin can be d...

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Problems solved by technology

The composition of the final light-colored rosin varies greatly, and because the light-color agent exists in the rosin, it has a non-negligible impact on the deep processing and utilization of rosin: (1) The light-color agent will remain in the rosin more or less , has a serious poisonous effect on the commonly used catalysts in the deep processing of rosin; (2) commonly used light coloring agents may cause direct harm to the human body when used in food or daily necessities industries; (3) at higher temperatures, sulfur-containing When the light color agent degrades and releases sulfur element to promote the disproportionation reaction of rosin and lighten the color of rosin, sulfur element may also generate SO 2 、H 2 S or other pollutants have an impact on the environment; (4) the content of sulfur, phosphorus and other elements in rosin and its deep-processed products exceeds the standard, which limits the sales of products

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