Granule decoloration active carbon and preparation method thereof

Abstract

The present invention relates to special active carbon for caramel decolorization and the preparation method thereof. The solid nutshell or coal serves as raw material which is processed by a physical chemistry immersion activation method to create active carbon. The immersion liquid is a water solution mainly comprising phosphoric acid, sodium hydroxide, magnesia and zinc chloride, wherein the proportioning by weight of each component is phosphoric acid: sodium hydroxide: magnesia: zinc chloride = 1:0.8~2.0:0.5~1.0:1~1.5. The obtained active carbon has an iodine value of 800~1000 mg / g, a caramel decolorization ratio of 80~100%, and a mechanical strength of 95%. The material is subjected to carbonizing, immersing, drying and activating treatment to create the active carbon product. The active carbon of the present invention has excellent decolorization property for macromolecule pigment, higher mechanical strength as general physical carbon, and wide application range. The traditional powdery carbon is replaced by granular activated carbon, the decolorizing pot is replaced by decolorizing column, the active carbon is changed from the disposable usage to the repeated and regenerated usage, and the decolorizing system can be continuously operated for a long time.

Description

technical field [0001] The invention relates to a granular activated carbon used for decolorization and adsorption, in particular to a special activated carbon used for caramel decolorization and a preparation method of the activated carbon. Background technique [0002] Caramel decolorization activated carbon is mainly used to remove organic macromolecular pigments in the production process of chemical industry, food and medicine, and is an important carbon species of activated carbon. For a long time, the decolorization of caramel is produced by chemical method, and the activator is Zncl 2 or H 3 po 4 , and its production process is shown in Figure 1. [0003] The use of sawdust as a raw material in the chemical production process is because the zinc chloride solution can be immersed in the interior of the sawdust fiber and dehydrated at high temperature to produce qualified caramel decolorized charcoal. The process determines that caramel dec...

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Problems solved by technology

[0005] 1. Sugar charcoal produced by conventional physical methods, such as coal-based charcoal and fruit shell charcoal, has developed micropores, high iodine adsorption value and methylene blue adsorption rate, but has no caramel decolorization performance and the ability to remove organic macromolecular pigments Weak, can only be used for the removal of medium and small molecule pigments and refined decolorization of pharmaceutical, chemical, food and other products, and cannot meet the decolorization of many intermediates in the production process, such as glucose, citric acid, glutamic acid, amino acid pharmaceutical intermediates Technical requirements for decolorization in the production process

[0006] 2. Chemical powdered charcoal uses wood as raw material, and 10 cubic meters of wood per ton of sugar charcoal is used as raw material. China's annual production of sugar charcoal of various specifications is 30,000 tons (accounting for 1\6 of the total charcoal), and about 300,000 cubic meters of wood are needed , which will undoubtedly result in the deforestation of a large number of forests and seriously damage the ecology

[0007] 3. Problems in the application process: the decolorization tank is an intermittent operation, the production site is dusty, and it is not suitable for high-tech products and modern enterprise management

The applicant disclosed the "preparation method of granular activated carbon for sugar decolorization" in the patent application number 200610045781.1. Although the activated carbon has good particle strength, the caramel decolorization rate and adsorption performance are still not ideal.

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