公开(公告)号：US4425252A

公开(公告)日：1984-01-10

申请号：US322921

申请日：1981-11-19

申请人： Virgil H. Cargle ,  Wilbur L. Bridges

发明人： Virgil H. Cargle ,  Wilbur L. Bridges

IPC分类号： C09K3/22

CPC分类号： C09K3/22

摘要： Abatement of respiratory coal dust is facilitated by water spraying the dusty area with a system having at least about 50 ppm of the combination of a water soluble sulfonic acid salt and a nonionic surfactant having an HLB ranging from 12 to 14.

摘要翻译： 通过用具有至少约50ppm的水溶性磺酸盐和HLB为12至14的非离子表面活性剂的组合的系统喷洒粉尘区域来促进减少呼吸性煤尘。

公开(公告)号：US4231956A

公开(公告)日：1980-11-04

申请号：US937316

申请日：1978-08-28

申请人： Daniel S. Sullivan, III ,  Wilbur L. Bridges

发明人： Daniel S. Sullivan, III ,  Wilbur L. Bridges

IPC分类号： C07C120/00 ,  C07C121/16 ,  C07C121/20 ,  C07C149/20

CPC分类号： C07C319/04 ,  C07C323/00

摘要： The process of preparing thioethers by reacting aliphatic thioalcohols, e.g., mercaptans, including hydrogen sulfide with activated, alpha, beta unsaturated compounds ##STR1## capable of participating in the Michael Addition Rection* in which X is a suitable electron withdrawing group. The Addition, which is carried out in the presence of a catalytic base is greatly improved with respect to minimizing formation of side products by utilizing a specially selected catalyst comprising one or more cyclic tertiary nitrogen compounds having an excellent balance between reactivity and selectivity. The preparation of thioethers from acrylic acid derivatives especially esters (CH.sub.2 .dbd.CH--COOR', R'=C.sub.1 --C.sub.8) is preferred. The preparation of the dimethyl ester of 3,3'-thiodipropionic acid to result in dimethylthiodipropionate of relatively high purity is especially preferred.* See Vogel, PRACTICAL ORGANIC CHEMISTRY, p. 912-913, Third Enlarged Edition.

摘要翻译： 通过使脂族硫醇（例如硫醇，包括硫化氢）与能够参与迈克尔加成裂解的活化的α，β不饱和化合物（IMAGE）反应制备硫醚的方法，其中X是合适的吸电子基团。 在催化剂存在下进行的添加在通过使用特别选择的催化剂（其包含一种或多种在反应性和选择性之间具有优异平衡的环状叔氮化合物）中最小化副产物的形成而大大改善。 从丙烯酸衍生物，特别是酯（CH 2 = CH-COOR'，R'= C 1 -C 8）制备硫醚是优选的。 特别优选制备3,3'-硫代二丙酸的二甲酯以产生相对高纯度的硫代二丙酸二甲酯。 *见Vogel，实际有机化学，p。 912-913，第三次放大版。