碳酸锌

Latest researches in the catalysts for synthesis of carbamate by ammonolysis of dimethyl carbonate;2. Progress in the catalysts for synthesis of carbamates by ammonolysis of dimethyl carbonate;3.4,4′-Methylene diphenyl carbamatewas synthesized by ammonolysis of dimethyl carbonate, a substitute of phosgene, and 4,4′-diaminodiphenyl methane with anhydrous zinc acetate as catalyst.

用碳酸二甲酯代替光气，以4，4′-二氨基二苯基甲烷为原料，在无水醋酸锌催化剂的作用下，经胺解反应合成了4，4′-二苯甲烷二氨基甲酸甲酯；测定了MDC的熔点；采用傅里叶变换红外光谱和氢核磁共振对产品结构进行了表征；考察了反应温度、DMC用量、反应压力、反应时间、催化剂用量对MDC收率的影响。

Under supercritical carbon dioxide conditions, the reaction of carbon dioxide and epoxides occurred with zinc maleate as the catalyst.

在超临界二氧化碳中，利用马来酸锌催化二氧化碳与环氧化物反应合成环状碳酸酯。

The crystallization during smelting and sequentially secondary metal-bearing minerals formed from weathering controlled the release of heavy metals in the waste residues.

土法炼锌特定的工艺导致的重金属在高温物理化学条件下的结晶行为，以及风化过程形成的含重金属碳酸盐类矿物相和次生风化矿物对重金属的释放迁移有重要意义。

With the increase of catalyst dosage, the desulfurization rate decreased using zinc oxide or manganese carbonate as oxidation catalyst, but first increased and then decreased using boric acid as the catalyst.

使用氧化锌或碳酸锰催化剂时，随着催化剂用量的增加，汽油脱硫率总体呈现降低的变化趋势。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。