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Study on Technical Conditions for Preparing 2,6-diisopropyl Naphthalene from Refined Naphthalene

Author: ZhaoGuiLi
Tutor: TianZhengHua；ZhangZhiQiang
School: Liaoning University of Science and Technology
Course: Chemical processes
Keywords: 2,6 - diisopropylnaphthalene Refined Naphthalene The presence of hydrogen isopropyl Static fractional crystallization Rare earth modified H-mordenite Transalkylation reaction
CLC: TQ242
Type: Master's thesis
Year: 2006
Downloads: 69
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Abstract


2,6 - diisopropylnaphthalene (2,6-DIPN) is a precursor of 2,6 - naphthalene dicarboxylic acid , the latter is a liquid crystal polymer monomer , for preparing a new type of polyester - polyethylene ethylene naphthalate ester and thermotropic liquid crystal polymer . This topic using Friedel - Crafts catalyst the vapor dealuminated H-mordenite (SDHM) instead of the traditional , refined naphthalene and propylene as raw material , shape-selective isopropylation 0.5L autoclave to prepare 2,6-DIPN . Refined Naphthalene nitrogen content in a significant impact on the level of activity of the catalyst . The lower the nitrogen content in the refined naphthalene , better reaction . The critical hydrogen isopropylation can effectively slow down the rate of catalyst deactivation . When the reaction conditions were 275 ° C , 0.4MPa H 2 , and the reaction time 7H , SDHM amount of 7% , naphthyl average conversion rate can be maintained at about 90% , 2,6-DIPN average yield of the target product not less than 35% , and the shape-selective rate close to 65% , has good practical value . Using rare earth is modified SDHM, acid so that the outer surface of the center is part of the coverage , and to improve the selectivity of the mordenite naphthalene isopropylation reaction . 2,6-DIPN selectivity of shape rate 2,6 -/DIPN ( % ) and 2,6 - / 2,7 -DIPN molar ratio improved significantly increased the yield of 2,6 -DIPN , and the easy separation and purification . Mixed rare earth (La, Ce, Pr) - modified catalyst , the reaction is better than a single rare earth La renewable maintained better activity . Applying a static fractional crystallization to give a purity of ≥ 99% of 2,6 -DIPN . The melt of the different concentration levels several times crystallized purified yield was improved to 87% in the production application value . Determination of 2,6 - ~ 2,7 - DIPN binary system , the lowest melting point of the eutectic temperature and the lowest total of composition, and the solid-liquid phase diagram , play a guiding role in the crystallization temperature control . Diisopropylnaphthalene intramolecular isomerization difficult to occur , and naphthyl the transalkylation reaction be enriched IPN product , beneficial use of byproducts . The DIPN conversion rate of 77% . Amorphous aluminosilicate LXC-11 is more suitable for the catalyst .

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