查询词典 methylal

This technique pro-duced not only N-phosphonomethyliminodiacetic acid with high quality but also a great deal of chloromethane by the hydrolyzation of dimethyl phosphite and methylal .

提供了一种利用亚磷酸二甲酯残液(亚磷酸二甲酯生产过程中的副产)和甲缩醛(甘氨酸法生产草甘膦过程中的副产)为原料来合成双甘膦的方法，采用该工艺可以合成高含量的双甘膦，而且利用亚磷酸二甲酯残液和甲缩醛的充分水解可生成大量的氯甲烷，从而大大提高上述副产物的综合利用价值，具有很好的发展前景。

Main business scope: polyformaldehyde methylal methanol sodium nitrite sodium sulfide protopine xylene glacial acetic acid soda ash Ethyl acetate ion-exchange membrane caustic soda Chloromethane AEO-9 polyethylene glycol and other major raw materials and products.

多聚甲醛甲醇甲缩醛亚硝酸钠硫化碱片碱二甲苯纯碱冰醋酸醋酸乙酯离子膜烧碱 AEO-9 氯甲烷聚乙二醇等主要原料和产品。

For the methylal synthesis by fluidized catalytic distillation, an mathematical model of equilibrium stage was set up on some assumptions.

针对甲缩醛合成流化催化精馏过程，在合理假设的条件下，建立了平衡级数学模型。

The tower structure is especially applicable to the process of methylal synthesis.

与传统塔型比较，该结构简单、催化剂易装卸，催化剂利用率高，易于建立催化精馏过程的模型和模拟放大，特别适用于甲缩醛合成催化精馏过程。

The synthesis technology of methylal is one of the subsidiary items of national key project titledthe process fo...

甲缩醛合成技术是国家攻关课题"甲缩醛氧化制浓甲醛技术"的子课题。

The experiment gains reaction parameters of methylal from formaldehyde and methanol,it also found a mathematical model for continuous production process.

通过实验取得了甲醛和甲醇合成甲缩醛的反应参数；建立了其连续生产工艺的数学模型，利用ASPEN PLUS软件对甲醛和甲醇缩合生成甲缩醛进行了模拟，结果表明反应精馏连续生产甲缩醛的工艺是可行的，转化率高达99%，并得到含甲缩醛99%的产物，同时确定了进料板和反应区。

The unit of 1000t/a methylal synthesis by fluidized catalytic distillation was designed according to the results of equilibrium stage simulation, together with the consideration of the existence of plate efficiency and utilization ratio of catalyst.

在模拟过程中，探讨了塔板数、空时、回流比等对催化精馏效果的影响，分析了各因素对催化精馏的耦合影响关系，得到了较适宜的理论塔板数、空时和回流比，为本体系的工业性试验用催化精馏塔设计提供了依据。

In this paper, methylal and diethoxymethane were used as end capping agents to improve the thermal stability of the product in molten copolymerization of trioxane with ethylene oxide or with dioxolane.

为此研究了在三聚甲醛与环氧乙烷或三聚甲醛与二氧五环熔融共聚体系中，通过封端剂甲缩醛或二乙氧基甲烷的使用，对热碱稳定的共聚甲醛的收率提高了3％左右。

The model for the process of methylal synthesis by fluidized catalytic distillation was established and was used to simulate and design the process. A 1000t/a methylal production unit was built and the test run was conducted with success.

从提出流化催化精馏新型塔结构入手，在本征动力学、宏观动力学、甲缩醛合成流化催化精馏模型与模拟设计和工业性试验等方面，进行了系统的理论和实验研究，取得了一系列研究结果，并获得了1000吨／年甲缩醛合成装置的试车成功。

The experiment results indicate that: the increases of catalyst concentration, feed mole ratio of methanol to formaldehyde and the decrease of total feed flow can increase the yield of methylal; the concentration of methylal in distillate also increases with the increase of catalyst concentration; that the effects of reflux ratio on the yield and concentration of methylal in distillate are different from conventional distillation process, an optimal value of reflux ratio exists between 1 and 2 for this process.

实验结果表明：回流比对甲缩醛收率和塔顶甲缩醛纯度的影响不同于一般的精馏过程，存在一个最优回流比，本过程最佳回流比在1-2之间；提高催化剂浓度，甲缩醛收率和塔顶甲缩醛纯度均增加；提高进料醇醛摩尔比也会提高甲缩醛收率；进料总流量对甲缩醛的收率的影响十分明显，进料总流量减少可以使甲缩醛的收率得到明显提高。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐