亚磷酸

During the manufacturing of the critical intermediate cephalosporin nucleus --7-amino-3-chloro-cephalosporanic acid diphenylmethyl ester hydrochloride salt, first the feasibility of the one-pot synthetic route of open loop, closed loop and ozonization when chlorine is passed over is qualified by experiments. Then the critical factors that will influence this reaction are studied as follows: the mol ratio of triphenyl phosphite and Diphenylmethyl 3-hydroxy-7-phenylacetaminoceph-3-em-4-carboxylate-l-oxide is four to one; the quantity of the stablizer should be at least more than two to one. The temperature of the system must be 25℃ when chlorine is passed over so that the hydrochloride can be precipitated to obtain cephalosporin nucleus of cefaclor--7-amino-3-chloro-cephalosporanic acid diphenylmethyl ester hydrochloride salt.

在制备关键中间体头孢母核7-氨基-3-氯头孢烷酸二苯甲酯盐酸盐时，先通过实验验证把开环、闭环、臭氧化三步在通入氯气时并为一锅煮的合成路线的可行性之外，又研究了影响该反应的几个重要因素：亚磷酸三苯酯与3-羟基-7-头孢烷-5-亚砜-2-甲酸二苯甲酯的摩尔比为4：1；稳定剂2-甲基-2-丁烯的用量至少大于2：1，通入氯化氢气体时体系温度在25℃时盐酸盐则能够顺利析出，获得头孢克洛的头孢母核—7-氨基-3-氯头孢烷酸二苯甲酯盐酸盐。

Methods: P-toluenesulfonic acid diethoxyphosphorylmethyl ester (4) was prepared from diethyl phosphate and paraformaldehyde by condensation and esterification.

以亚磷酸二乙酯和多聚甲醛经缩合、酯化得到对甲苯磺酸羟甲基磷酸二乙基酯(4)。

Another example is about the synthesis of AlPO〓-21, it was prepared by using diethylamine as template.

该链是一条亚磷酸铝链，在水热反应过程中，在相关模板剂的协同作用下，P物种经过缓慢的氧化-还原反应原位转变生成P物种，并通过水解与缩合的自组装路线而生成相关类型的磷酸铝分子筛。

The polymeric sol is obtained by process of preparing a calcium salt solution, containing calcium ethoxide dissolved in organic acid, and a phosphate solution, containing triethyl phosphite or triethyl phosphate dissolved in the organic acid, mixing the calcium salt solution with the phosphate solution to produce a mixed solution, and aging the mixed solution.

本发明的磷酸钙化合物的聚合物溶胶是通过如下步骤制备的：制备含有溶解在有机酸中的乙醇钙的钙盐溶液和含有溶解在该有机酸中的亚磷酸三乙酯或磷酸三乙酯的磷酸盐溶液；及将该钙盐溶液和该磷酸盐溶液混和制得混合溶液，并老化该混合溶液。

The test results show that density and the total phosphorus content of HEDPA have linear relationship. The content of phosphorus can be converted by subtracting the contents of impurities, namely phosphorous acid and orthophosphoric acid, so that the content of active component can be determined directly with density.

通过实验发现密度与HEDPA中总磷含量呈线性关系，减去杂质即亚磷酸和正磷酸含量换算出磷含量，即可通过测量密度直接测出活性组分的含量。

Effects of the mass ratio of organic phosphonic acid to zinc biphosphate, compound system amount, corrosion time and temperature, and pH value on the anticorrosive efficiency were investigated.

以四乙烯五胺、甲醛和亚磷酸为原料合成了有机膦酸类缓蚀剂，与磷酸二氢锌复配，考察了有机膦酸类缓蚀剂与磷酸二氢锌质量比、复配体系加量、腐蚀时间、腐蚀温度及体系pH值对复配体系缓蚀效果的影响。

Zirconium phenyl phosphonate Zr (C6H5PO3) 2nH2O and its derivatives Zr(C6H5PO3)(subscript 2-x)(HPO4)nH2O and Zr (C6H5PO3)(subscript 2-x)-(HPO3)nH2O were synthesized and sulphonated.

合成了苯膦酸锆及其混合配体形式的苯膦酸－磷酸锆和苯膦酸－亚磷酸锆，并通过层间苯环磺化制备了不同组成的磺化苯膦酸－磷酸锆。

The results showed that the yield of the esterification stage was 95.0% and the yield of the addition stage was 90.0% when the mole ratio of trimethylolalkane,triethyl phosphate and dimeth...

结果表明：亚磷酸三乙酯：三羟甲基丙烷：甲基磷酸二甲酯的摩尔比为1.05：1：1.2，自制复合有机酸为酯交换反应催化剂，质量分数为0.1%，反应温度85℃，反应时间3 h，自制复合有机碱为加成反应的催化剂，质量分数为1.0%，反应温度200℃，反应时间8 h，酯交换反应收率95.0%，加成反应收率90.0%。

Cyclic phosphate was synthesized from trimethylolalkane,triethyl phosphate and dimethyl methyl phosphonate,which can be used as environment-friendly durable flame retardant for the padding process of PET fabric.

以亚磷酸三乙酯、三羟甲基丙烷和甲基磷酸二甲酯为原料合成了环状磷酸酯，可作为涤纶织物浸轧用的环保型耐久阻燃剂。

The optimization reaction condition is that using the mixture catalyst of phosphorous acid ester and dihydrogen phosphate, and toluene as solvent, at 105 oC and refluxing 30 hours, the yield is 90% with purity over 95%.

在最佳条件下，即在混合催化剂亚磷酸酯/磷酸氢盐的作用下，以甲苯为溶剂，在105 ℃反应30 h，酯化收率90%，纯度95%以上。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。