一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
010-86108875
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List Maltitol
585-88-6

Maltitol synthesis

2synthesis methods
Maltitol is obtained from hydrogenated maltose syrup. Starch is hydrolyzed to yield a high-concentration maltose syrup, which is hydrogenated with a catalyst. After purification and concentration, the syrup is crystallized.
-

Yield:-

Reaction Conditions:

with hydrogen in water at 99.84; under 30003 Torr; for 4 h;Autoclave;Reagent/catalyst;

Steps:

2.3. Catalytic performances test

General procedure: The liquid-phase hydrogenation of sugar was performed at 4.0 MPaof H2 pressure and 373 K in a 200-mL stainless steel autoclave with aTeflon tube to avoid metal contamination, in which 0.5 g of Ni catalystand a sugar aqueous solution (10 wt.% in 50 mL H2O) were well mixed.According to the drop of the H2 pressure in the autoclave within 10min, both the specific activity (the H2 uptake rate per gram of Ni, RHm,mmol h-1 gNi-1) and the intrinsic activity (the H2 uptake rate per m2 ofNi, RHS, mmol h-1 mNi-2) were calculated by using the ideal gasequation. The reaction mixture was sampled at intervals for productanalysis through a liquid-phase chromatograph (Agilent 1200)equipped with a carbohydrate column (Shodex, SC1011) and a refractiveindex detector at 333 K with water as movable phase at 0.50mL min-1. Preliminary kinetic studies revealed that there was a plateauin the dependency of the reaction initial rate upon the stirring rateabove 1000 rpm and that the reaction initial rate varied linearly withcatalyst amount from 0.1 to 1.0 g, indicating that the stirring rate of1200 rpm was high enough that the hydrogenation rates were independentof mass transfer. After cooling to room temperature at theend of the reaction, the catalyst was separated by centrifugation andwashed with deionized water for further characterizations and applications.In order to determine the catalyst durability, the used catalystwas centrifuged and washed thoroughly with distilled water after eachrun of the reaction. Then, the used catalyst was reused with freshcharge of sugar for subsequent recycle runs under same reaction conditions.

References:

Yong, Yang;Huajun, Gu;Qingxiao, Zhang;Fang, Zhang;Hui, Li [Catalysis Today,2021,vol. 365,p. 282 - 290]

Maltitol Related Search:

阿图什市| 凤冈县| 剑川县| 融水| 弥渡县| 双辽市| 潞西市| 甘德县| 界首市| 东方市| 剑河县| 达孜县| 英超| 监利县| 宁津县| 西畴县| 景洪市| 金阳县| 方城县| 来安县| 鲜城| 泰来县| 城固县| 大新县| 泰安市| 六安市| 天台县| 交城县| 佛冈县| 黄浦区| 连山| 林芝县| 宝丰县| 新绛县| 遵义市| 闻喜县| 万源市| 潞城市| 岳池县| 大厂| 塔河县|