共查询到20条相似文献,搜索用时 93 毫秒
1.
西德赫斯特公司大力开展铜甲(?)棉用活性染料的开发研究。据专利报导,甲(?)的合成是将重氮化的4-(2-磺酸酯基乙砜基)-2-氨基苯酚-6-磺酸与由苯甲醛和2-羧基苯肼-4-磺酸缩合的腙进行偶合;将重氮化的3-氨基4-羟基苯基-β-(硫代磺酸酯基)乙基砜与由苯甲醛和2-羧基苯肼-4-磺酸缩合的腙进行偶合;将重氮化的1-氨基-2-羟基-5-[2-(硫代磺酸酯基乙 相似文献
2.
3.
气液法合成氨基磺酸的研究 总被引:2,自引:0,他引:2
一、氨基磺酸合成工艺简述氨基磺酸又名磺酰胺酸,化学结构式NH_2-O-(?)-OH,是一种重要的精细化工原料。其工业合成的工艺有气相法和液相法,目前应用于生产的以液相法为主。1.气相合成法:用硫酸生产系统中出来的 SO_3气体和 NH_3通过气相反应制取亚氨基二磺酸胺,然后在硫酸中水解得氢基磺酸,氨基磺酸在硫酸溶液中析出,经分离、洗涤、 相似文献
4.
5.
6.
为探讨木质素磺酸镁作为辅助添加剂在纤维原料酶解过程的作用机制,以两种木质素磺酸镁为研究对象,考察了不同来源木质素磺酸镁组构差异及其在不同纤维原料酶解过程中的作用。研究发现,商品木质素磺酸镁较自制木质素磺酸镁具有更高的磺化度,但自制木质素磺酸镁具有更高总羟基相对含量。商品木质素磺酸镁和自制木质素磺酸镁对微晶纤维素酶解均有促进作用;对于木质纤维原料酶解,两种木质素磺酸镁对水热法预处理物料均有抑制作用。对亚硫酸氢镁预处理物料酶解,仅低浓度的自制木质素磺酸镁表现出促进作用。该研究为解释木质素磺酸镁对纤维素原料酶解的影响机制提供了理论依据。 相似文献
7.
8.
α-蒽醌磺酸是重要的染料中间体。在合成过程中,为了正确测定α-蒽醌磺酸的生成量,我们采用薄板层析,使α-蒽醌磺酸与β-蒽醌磺酸,2,6-或2,7蒽醌双磺酸等分离,然后利用α-蒽醌磺酸对257~258mμ的紫外光有一吸收峰,用紫外分光光度法进行定量测定。整个分析方法简述如下: 相似文献
9.
本文介绍了一种测定2,4-二磺酸基苯甲醛含量的方法.2,4-二磺酸基苯甲醛与亚硫酸氢钠加成反应生成4-(羟基磺酸基甲基)苯-1,3-二磺酸,再与碳酸氢钠共热释放出亚硫酸氢钠,然后用碘量法测亚硫酸氢钠含量,从而分析2,4-二磺酸基苯甲醛的含量. 相似文献
10.
11.
12.
13.
《分离科学与技术》2012,47(8):2208-2224
Abstract The potential use of blank alginate beads and immobilized dead algal cells for the removal of naphthalene from aqueous solutions was investigated in this study. The effects of contact time, solution pH, and naphthalene concentration on the sorption of naphthalene on blank alginate beads or immobilized dead algal cells were studied. The effect of the presence of other pollutants on the sorption of naphthalene on immobilized dead algal cells was also studied. Batch adsorption experiments showed that the removal of naphthalene on both sorbents was pH dependent and significant removal of naphthalene was obtained at pH 4. Dynamic sorption experiments revealed that the biosorption of naphthalene on either sorbent was rapid where the equilibrium uptake occurred within 10 minutes, and the biosorption of naphthalene on either sorbent followed the pseudo-second order kinetics. Analysis of the equilibrium sorption data showed that naphthalene sorption on either sorbent could be fitted to the Langmuir, Freundlich, and Dubinin-Radushkevich (D–R) isotherm equations. Competitive biosorption experiments showed that biosorption of naphthalene on immobilized dead algal cells was adversely affected by the presence of either heavy metals such as copper and nickel, and chelating agents such as citric acid. 相似文献
14.
从粗苯分缩油中提取的低萘洗油,在洗苯的同时完成了洗萘,既确保了城市煤气的萘含量,还可获得合格的工业萘。 相似文献
15.
《Fuel Processing Technology》2002,79(1):77-80
To clarify the mechanism of naphthalene hydrogenation to cis- and trans-decahydronaphthalene (decalins) via tetrahydronaphthalene (tetralin), the rate of naphthalene hydrogenation was compared with those of tetralin and tetralin containing 3–10 mol% naphthalene over a TiO2-supported Pt catalyst. Tetralin was hydrogenated to decalins readily, while the naphthalene hydrogenation did not take place under the same reaction conditions (433 K and 2.96 MPa). When 3–10 mol% naphthalene was added to tetralin, the rate of hydrogenation decreased clearly with an increase of naphthalene content. The observation suggests that naphthalene interacts with surface metals strongly and prevents the hydrogenation of tetralin. 相似文献
16.
17.
18.
19.
对萘、2-甲基萘、甲苯和二甲苯等原料制备2,6-二甲基萘的各种工艺进行了综述,并对目前工业化路线的生产成本进行了比较,提出在我国实现工业化生产时应注意的问题。 相似文献
20.
萘系减水剂是一种用途较广性能优越的高效减水剂,这类减水剂具有成本低、减水率高的优点,羟基改性萘系减水剂相当于在部分萘磺酸甲醛混合物的萘环上引入羟基基团,我们在通过一系列的实验优化比较之后,得到了最佳的工艺条件:当萘与萘酚的物质的量比为95∶5,总萘与硫酸的物质的量比为1∶1.3、磺化时间为2 h、水解水的量为10 mL、常压缩合时间为5 h的时候,得到的产品净浆流动度比较好,并对产品进行了红外分析,与传统的萘系减水剂进行了比较。 相似文献