dehydration synthesis

△~ 6-6-methyl spirolactone(ⅷ) was synthesized from epoxide(ⅱ) through the following series of reaction, viz, Grignard synthesis with the introduction of 6-methyl and side chain carboxyl groups simultaneously, followed by catalytic hydrogenation, chromic acid oxidation, dehydration and dehydrogenation.

△~6-6-甲基螺甾内酯（Ⅷ）可从环氧化合物（Ⅱ）经Grignard试剂一步加入6-甲基及侧链羧基，继用常法氢化、氧化、脱水、脱氢等步骤合成。

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The catalyst is called bis-function catalyst which catalyzes both the synthesis dehydration of methanol.

合成气直接制二甲醚的催化剂称之为双功能催化剂,即同时具有甲醇合成功能和甲醇脱水功能.

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The most commonly used dehydration agent is organic synthesis polymer cationic polyacrylamide ( CPAM). Although the dehydration effect of CPAM is good, the degradation products and acrylamide are harmful to the environment.

常用的污泥脱水药剂是有机合成高分子化合物阳离子聚丙烯酰胺（CPAM），虽然其脱水效果较好，但降解产物和丙烯酰胺单体都对环境不利。

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Equilibrium conversion and synergistic effect between the methanol synthesis and methanol dehydration for the direct synthesis of dimethyl ether from coal-based syngas was studied.

对煤基合成气一步法制二甲醚反应体系的平衡转化率及甲醇合成反应与甲醇脱水反应的协同效应进行了研究。

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All the fruits determined contained 18 amino acids from proteins by dehydration Synthesis, among which glutamic acid content was the highest and the rest differed in different species.

从测定的15个种的竹果来看，均含有18种蛋白质水解的氨基酸，其中均以谷氨酸的含量为最高，其余各种氨基酸的含量比例各不相同。

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Ability of methanol dehydration and methanol synthesis hybrid catalyst in slurry bed was investigated under reaction conditions of 240-280 ℃ and 5.0 MPa.

在温度240-280℃、压力5.0MPa的反应条件下，考察了浆态床反应器中甲醇脱水催化剂和甲醇合成催化剂的稳定性。

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The kinetics of the dimethyl ether ( DME) synthesis from syngas containing N2 over a bifunctional catalyst of methanol synthesis catalyst and methanol dehydration catalyst have been investigated under 3-7 MPa and 220-260C, the reactor was a tubular flow integral reactor.

研究了由商业甲醇合成催化剂和改性分子筛脱水催化剂混合组成的双功能催化剂上含氮合成气一步法制取二甲醚的本征动力学。实验是在3-7Mpa、220-260℃条件下进行的。

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