Industrial benzene anhydride of preventing storage colour-change and its preparing method
A kind of phthalic anhydride and industrial technology, applied in the field of industrial phthalic anhydride and its preparation method, can solve the problems such as the requirement of benzoic acid content, and achieve the effect of avoiding economic loss
Active Publication Date: 2007-08-29
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
[0026] As shown in Figure 1, the crude phthalic anhydride produced by o-xylene gas-phase catalysis comprises the crude phthalic anhydride produced by oxidation gas cooling, and contains 0.05-0.1% benzoic acid by weight; in the refining of phthalic anhydride, light The components contain 30-40% benzoic acid by weight. The rest of the process steps adopt the prior art.
[0027] Make the content of benzoic acid in the phthalic anhydride as shown in table 3:
[0028] Table 3 Benzoic acid content table
[0029]
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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 in particular relates to an industrial phthalic anhydride for preventing discoloration during storage and a preparation method thereof. Background technique [0002] The discoloration of phthalic anhydride storage is a problem that plagues most phthalic anhydride manufacturers. According to the data obtained by the applicant, the phthalic anhydride in the domestic market, including the phthalic anhydride produced by many foreign manufacturers, has more or less quality degradation such as melting chromaticity, heat-stable chromaticity index darkening, and appearance discoloration after storage for a period of time. Phenomenon, serious will change from qualified products to unqualified products. [0003] According to the analysis of the production reaction principle and actual situation of phthalic anhydride, the main reasons for the decline in the quality of the finished phthalic a...
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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