乙烯醇

During the Polyvinyl Alcohol producion, the product cannot be polymerized by the monomer directly. Generally, it can be obtained by alcoholysis of poly vinyl acetate in the solution of methanol.

在聚乙烯醇生产过程中，因产品不能由其单体直接聚合得到，通常采用聚醋酸乙烯在甲醇中醇解得到，该过程副产大量的醋酸甲酯。

This product and PVC and ethylene vinyl acetate copolymer has good histocompatibility, but also acrylic and poly methyl methacrylate, polyvinyl butyral, nitro cellulose, ethyl butyl acetate fibers and cellulose, such as miscibility.

本品与聚氯乙烯和乙烯醋酸乙烯共聚物有良好的相溶性，还和聚甲基丙稀酸甲酯、聚乙烯醇缩丁醛、硝基纤维素、醋酸丁酯纤维和乙基纤维素等相溶。

Jiangmen City, Czech Run Chemical Trading Co., Ltd. operating chemical raw materials, mainly toluene, xylene, a rough, crude dimethyl, mixed aromatics, mesitylene, crude Sanjia, mixed dimethoxy, methylal, n-butyl, B ester, n-butyl alcohol, isobutyl alcohol, vinyl acetate, styrene, butyl ether, cyclohexanone, 6 #, 120 #, 200 #, titanium dioxide, phthalic anhydride, DOP, isopropanol for Main Product, Quality Assurance , the price advantage of abundant supply.

江门市捷润化工贸易有限公司经营化工原料，主要为甲苯、二甲苯、粗甲、粗二甲、混合芳烃、三甲苯、粗三甲、混二甲、甲缩醛、正丁酯、乙酯、正丁醇、异丁醇、醋酸乙烯、苯乙烯、丁醚、环己酮、6#、120#、200#、钛白粉、苯酐、DOP、异丙醇为主营产品，质量保证，价格优势，货源充足。

According to the compared analysis of prevention sulfur deposition during the production of high sour gas well, the key of prevent sulfur deposition and to control sulfur blocking is choose right element sulfur, carry out some research on the selection of sulfur solution, remix the triethylenetetramine, diethylenetriamine and monoethanolamine in different ratios, finally formed LJ-1 compounding which is best fit the production of north Sichuan province.

对比分析了多种硫沉积防治方法，防治的关键在于溶硫剂的合理选择，通过溶硫剂优选室内评价实验研究筛选出三乙烯四胺、二乙烯三胺和乙醇胺等三种单剂，按照不同的比例与现场使用的防冻剂乙二醇进行复配，最终形成了适合川东地区高含硫气井的溶硫剂LJ-1合理配方，性能评价实验表明溶硫剂LJ-1溶硫速率快、溶解度高、腐蚀小。

Hebei Shuanglong Silver lacquer paint factory price is lower than the other plant 1 / 2, to call upon the lowest price; thousands of color paint, alkyd paints, Nitro-paints, silicone paints, quick drying paint , acrylic paint, whiteá, lead oil, blending paint, alkyd enamel, silver paint, Antirust Paint, all kinds of primer, topcoat, works with paint, steel with paint, nitro Enamel, heat resistant high temperature paint, crossed the road paint, epoxy coal Lek varnish, lacquer chimney, perchlorethylene paint, hundreds of industrial, civilian paint factory price is lower than the other 1 / 2; bucket can also be the lowest shipping barrel also can be customized!

，河北双龙银粉漆厂油漆价格低于其它厂1/2 ，来电话即告之最低价格；★数千种色油漆，醇酸油漆，硝基油漆，有机硅漆，快干油漆，丙烯酸漆，白厚漆，铅油，调合漆，醇酸磁漆，银粉漆，防锈漆，各种底漆，面漆，工程用漆，钢铁用漆，硝基磁漆，耐热耐高温漆，马路划线漆，环氧煤沥清漆，烟囱漆，过氯乙烯漆，数百种工业、民用油漆价格低于其它厂1/2 ；一桶也可以最低价发货，一桶也可订做！

The invention provides a method for homopolymerizing conjugated dialkene or co-polymerizing conjugated dialkene and monovinyl aromatic hydrocarbon. The method comprises the following steps: the conjugated dialkene is homopolymerized or the conjugated dialkene and the monvinyl aromatic hydrocarbon are co-polymerized randomly. The method is characterized in that at least one alkali metal alkoxide compound expressed by the formula is used as a structure regulator; in the formula, R is linear chain or branched chain alkylidene radical having 1 to 10 carbon atoms; M is alkali metal selected from Li, Na, K, Rb and Cs.

本发明提供了一种使共轭二烯烃均聚或者使共轭二烯烃与单乙烯基芳烃共聚的方法，包括在阴离子聚合条件下使共轭二烯烃进行均聚或者使共轭二烯烃与单乙烯基芳烃进行无规共聚，其特征在于采用至少一种式所示的碱金属醇盐化合物作为结构调节剂，其中R为具有1-10碳原子的直链或支链亚烷基；以及M为选自Li、Na、K、Rb和Cs的碱金属。

The pure isomers 3-(1-hydroxyethyl)-8-vinyldeuteroporphyrin Ⅸ and 3-vinyl-8-(1-hydroxyethyl)deuteroporphyrin Ⅸ were obtained from protoporphyrin Ⅸ dimethyl ester.Starting from these two acetylating compounds,eight new porphyrin derivatives were synthesized through an alkyloxy fission reaction.

以原卟啉Ⅸ二甲酯为起始原料，合成并分离得到3-(1-羟乙基)-8-乙烯基次卟啉Ⅸ（Ⅱ1）和3-乙烯基-8-(1-羟乙基)次卟啉Ⅸ（Ⅱ2）二个异构体，两者分别经酰化后与醇进行烷氧裂解反应合成了8个全新的卟啉衍生物。

The formation of charge transfer complex was studied in the first part. The second part includes the synthesis and characterization of the acrylated unsaturated polyester and the kinetic studies on the Ar-UPE/ triethylene divinyl ether (DVE-3) photocuring system, the rheology and properties of film after photocuring. The third part includes the synthesis and characterization of the urethane modified unsaturated polyester and the kinetic studies on the PU-UPE/DVE-3 photocuring system, the rheology and properties of film after photocuring. The fourth part includes the synthesis and characterization of the vinyl ether end capped polyurethane and the kinetic studies on the VE-PU/DVE3 photocuring system, the rheology and properties of film after photocuring.

整个研究工作分为四个部分：一是电荷转移复合物的研究；二是丙烯酰氧基化不饱和聚酯的合成，表征，Ar-UPE/二缩乙二醇二乙烯基醚（DVE-3）体系光固化动力学研究以及Ar-UPE/DVE-3体系流变性能和光固化后涂膜综合性能的研究；三是氨酯改性的不饱和聚酯的合成，表征，PU-UPE/DVE-3体系光固化动力学研究以及该体系光固化后涂膜综合性能的研究；四是乙烯基醚封端的聚氨酯的合成，表征，VE-PU/马来酸二甲酯体系光固化动力学研究以及VE-PU/DMA体系流变性能和光固化后涂膜综合性能的研究。

For the stepwise mechanism, the ethylene molecule was firstly adsorbed at the Brnsted acid site via π-hydrogen bonding to form a stable complex, which then went through the protonation, leading to the formation of the ethoxide intermediate. Furthermore, the ethoxide reacted with the second ethylene molecule to form the butoxide product.

对于分步反应机理，乙烯分子首先通过π-氢键作用在酸性位形成稳定的吸附络合物，再进一步发生质子化并生成乙醇盐中间体，随后乙醇盐与第二个乙烯分子发生碳－碳键结合形成丁醇盐产物。

In addition, the invention further relates to a catalyzer combination used for polymerizing a conjugated dialkene monomer and the anions of an optional mono-vinyl aromatic hydrocarbon into a polydiene polymer having high and medium vinyl content. The catalyzer combination comprises an organolithium compound used as an anionic polymerization initiator, at least an alkali metal alkoxide compound expressed by the formula as a structure regulator.

此外，本发明还涉及一种用于将共轭二烯烃单体和任选的单乙烯基芳烃阴离子聚合成具有中高乙烯基含量的聚二烯聚合物的催化剂组合物，其包含作为阴离子聚合引发剂的有机锂化合物，和作为结构调节剂的至少一种式所示的碱金属醇盐化合物。

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。