Industrial benzene anhydride of preventing storage colour-change and its preparing method
A phthalic anhydride, industrial technology, applied in the field of industrial phthalic anhydride and its production method, can solve the problems of benzoic acid content requirements, etc., and achieve the effect of avoiding economic losses
Active Publication Date: 2010-01-20
山东宏信化工股份有限公司
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Problems solved by technology
[0006] However, there is no requirement for benzoic acid in the current national standard for phthalic anhydride, and only a few domestic enterprises using phthalic anhydride have requirements for the content of benzoic acid in phthalic anhydride, which is generally a negotiated value.
Most phthalic anhydride manufacturers did not control this index due to no standard requirements and no clear control value, and no literature was found that controlling this index can prevent phthalic anhydride from becoming darker after a period of storage
Method used
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Embodiment 1-8
[0027] Such as figure 1 The process flow shown, the production of phthalic anhydride by the o-xylene gas phase catalytic method includes oxidizing gas cooling to prepare crude phthalic anhydride. The crude phthalic anhydride contains 0.05-0.1% by weight of benzoic acid; in the refining of phthalic anhydride, in the light component Contains 30-40% benzoic acid by weight. The remaining process steps adopt existing technology.
[0028] The content of benzoic acid in the prepared phthalic anhydride is shown in Table 3:
[0029] Table 3 Benzoic acid content table
[0030]
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The invention relates to industrial benzene anhydrides that avoid storing color changing. It could make the content of benzoic acid bellow 0.020% in the industrial benzene anhydrides. The invention could avoid storing color changing.
Description
Technical field [0001] The invention belongs to the technical field of phthalic anhydride, and specifically relates to an industrial phthalic anhydride for preventing storage discoloration and a preparation method thereof. Background technique [0002] Discoloration of phthalic anhydride in storage is a problem that plagues most phthalic anhydride manufacturers. According to the data held by the applicant, the phthalic anhydride in the domestic market includes the phthalic anhydride produced by many foreign manufacturers. After a period of storage, there are more or less quality degradations such as melting chromaticity, darkening of thermal stability chromaticity index and discoloration of appearance. Phenomenon, serious ones will change from qualified products to unqualified products. [0003] According to the analysis of the reaction principle and actual situation of the production of phthalic anhydride, the main reasons for the deterioration of the quality of the finished phth...
Claims
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IPC IPC(8): C07D307/89C07B63/00
Inventor 李良俊李艳玲董长胜马新明
Owner 山东宏信化工股份有限公司