查询词典 acid ratio

The invention relates to a process for producing polyethylene terephthalate 1, 3-propanediol, which comprises the following steps: using titanic acid ester as major catalyst, using germanium compounds and cobalt compounds as synergic catalyst, conducting esterification reaction for poly terephthalic acid and 1, 3-propanediol according to the molar 1:1.05-2.2 under the nitrogen pressure of 0.1-0.4MPa and 230-265 DEG C, or conducting ester exchanging reaction for poly terephthalic acid and 1, 3-propanediol according to the molar ratio 1:1.8-2.2 in 160-220 DEG C, decompressing reaction to high vacuum 10-150Pa, wherein the final temperature of reaction is 265-275 DEG C, recovering to normal pressure with nitrogen to obtain the PTT product.

本发明涉及一种生产聚对苯二甲酸1，3-丙二醇酯的方法，采用以钛酸酯为主催化剂，锗化合物和钴化合物为协同催化剂，对苯二甲酸二甲酯和1，3-丙二醇按摩尔1∶1.05-2.2，在0.1-0.4MPa氮气压力和230-265℃下进行酯化反应，或对苯二甲酸二甲酯和1，3-丙二醇按摩尔比1∶1.8-2.2，在160-220℃进行酯交换反应，将反应减压至高真空10-150Pa，反应终温在265-275℃，用氮气恢复到常压，得到本PTT产品；大大缩短了反应时间，直接聚合制备特性粘度在0.7-1.05dL/g的PTT切片，使反应产物色相良好，PTT产品可用于纤维加工及工程塑料领域。

Optimal process conditions for preparing 2-oxo-1, 4-piperazine diacetic acid(3-KP): 2-oxo-1-piperazine acetic acid was combined with chloroacetic acid at a mole ratio of 1 to 1.1, at temperature 40℃for 8 hours.

通过单因素分析，合成3-KP 的最佳反应条件为：反应温度为40℃，反应时间为8 小时，氯乙酸∶S-KP 的摩尔比为1.1∶1。

The results suggest that there are significant fatty acid and amino acid metabolism changes in NASH. Excessive fatty acids accumulation in hepatic cells、ω-6/ω-3 ratio imbalance, dodecanoic acid decreased, and some amino acids contents changes are related to hepatic inflammation and injury.

结果提示NASH大鼠肝组织存在明显的脂肪酸谱和氨基酸谱变化，肝细胞内各类脂肪酸聚积、ω-6：ω-3PUFAs比率失衡、正十二烷酸降低以及某些氨基酸含量变化等可能对脂肪肝炎症发生、肝损伤有重要作用。

The hydrogenation and methyl esterification of furoic acid over Pd-Ni/γ-Al2O3 catalysts was investigated in fixed bed micro-reactor under different conditions such as reaction temperature,pressure,H2 space velocity,space velocity of furoic acid and methol,ratio of H2 and furoic acid and so on.

以糠酸、甲醇、氢气为原料，采用连续流动固定床微反应器，Pd-Ni/γ-Al2O3为催化剂，使糠酸一步加氢甲酯化生成α-四氢糠酸甲酯。

The hydrogenation and methyl esterification of furoic acid over Pd-Ni/γ-Al2O3 catalysts was investigated in fixed bed micro-reactor under different conditions such as reaction temperature,pressure,H2 space velocity,space velocity of furoic acid and methol,ratio of H2 and furoic acid and so on.

以糠酸、甲醇、氢气为原料，采用连续流动固定床微反应器，Pd-Ni/γ-Al2O3为催化剂，使糠酸一步加氢甲酯化生成α-四氢糠酸甲酯。研究了反应的温度，压力，气、液体流速，进料流量等因素对催化反应的影响。结果表明：在1.5MPa，250℃，氢气空速3300 h-1，液体空速3.0 h-1(氢油比为50)时，糠酸转化率为96.6%，四氢糠酸甲酯的选择性97.2.0%，产率94.0%。催化剂稳定性较好，连续运转280小时后未见活性下降。该反应体系活性高，选择性好，反应压力低，催化剂性能稳定，操作简单，产物易分离

By the The equipment,The ratio in use of resin was increased inside VC manufacture , less acid, alcali and water was spend, The operator make less error then before due to automatization level was increased. So the production level of the gulonic acid was increased,The cost price of the gulonic acid was reduced, It is very important to increase greatly the economic effectiveness of the enterprise.

使用该设备系统可提高VC生产中提取工序的树脂用率，减少树脂使用过程中的酸、碱及水的消耗，同时自动化水平提高，人为失误减少，最终可提高古龙酸的生产水平，降低古龙酸的生产成本，对大幅度提升企业的经济效益有重大意义。

By the The equipment,The ratio in use of resin was increased inside VC manufacture , less acid, alcali and water was spend, The operator make less error then before due to automatization level was increased. So the production level of the gulonic acid was increased,The cost price of the gulonic acid was reduced, It is very important to increase greatly the economic effectiveness of the enterprise.3, Finished the industrialization apparatus design and feasibility studies, and the new technical equipment was run triumphantly in industrialized production.

使用该设备系统可提高VC生产中提取工序的树脂用率，减少树脂使用过程中的酸、碱及水的消耗，同时自动化水平提高，人为失误减少，最终可提高古龙酸的生产水平，降低古龙酸的生产成本，对大幅度提升企业的经济效益有重大意义。3、完成工业化装置设计及可行性研究，并推上了生产。

The amount of hydroxyacetic acid , equal to that of sodium chloride, produced from chloroacetice acid hydrolysis is determined by adopting Moore method and there fore the ratio of transformation of chloroacetice acid hydrolyzed can be calculated.

氯乙酸水解生产羟基乙酸的工艺过程中产生等物质量的氯化钠，采用莫尔法测定氯乙酸水解的产物氯化钠，并计算氯乙酸的水解转化率，从而选择和控制水解反应的条件。

The results show that the optimum conditions are: the mole ratio of malonic acid to benzaldehyde 1.0:0.9, the dosage of proline 4.0% of the weight of malonic acid and the reaction time 4h, the yield of cinuamic acid is 99.0% under the optimum conditions.

实验结果表明，合成肉桂酸的最合适条件：原料比为1.0：0.9，L-脯氨酸用量为丙二酸质量的4.0%，反应时间4h，在此最佳条件下，肉桂酸的收率达到99.0%。

In this article, high DS and low viscosity carboxymethyl starch was prepared in aqueous media through the reaction between corn starch with acid treatment and etherifying agent, the effect of acid treatment time, liquor/material ratio, the amount of sodium hydroxide, the amount of monochloroacetic acid, etherification time, and reaction tempera.

以玉米淀粉为原料，采用酸化-醚化复合变性的方法在水相中制备高取代度低黏度羧甲基淀粉，探讨了酸化时间、液固比、NaOH用量、ClCH2COOH用量、醚化反应时间、反应温度对羧甲基化过程的影响，研究发现，对原淀粉进行酸化，可以在不增加其它反应试剂用量的基础上提高产物的取代度，但是酸化时间不应过长。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。