This article adopts chloroactic acid and sodium carbonate as materials to produce Sodium Chloroacetate,while adjusting pH of Sodium Chloroacetate solution to 8~9 and temperature to 70~75 ℃. Then sodium hyposulfite is added to produce Bunte Salt,and sulfuric acid about 10 percent of weight of reactants for acidification with the condition that the temperature is 80~90 ℃ and the time 80 minutes.
It was discovered that 1000 μg/g of sodium hyposulfite plus 62. 5 μg/g of cysteine was an effective protector for enzyme activities and raised the activities by 32. 57% of control.
The content of free aldehyde was come to stand content(≤25%)by using the method of hyposulfite titrimetry to determined. The mechanical properties meet-standard requirement(GB/T9846-1988).
Two test solution are abstracted,one is determinated of Cu with titration iodimetry that is to adjust acid value of solution by ammonium acetate,in the micacidic solution of pH 3.0~4.0,Cu(Ⅱ)react on potassium iodide produces iodonium,iodonium is titrated by the solution of sodium hyposulfite standard by indicator of starch.
The hydrolysis is inhibited by benzamidine and hyposulfite but not by soy-bean trypsin inhibitor; horse plasma kallikrein also produces this hydrolysis.
Il est possible d'obtenir un développement satisfaisant des émulsions K-5 à l'aide de quatre constituants seulement: amidol, sulfite de sodium, acide citrique et hyposulfite.
The conventional methods for treating Cu-containing wastewater include ion exchange, bath side electrolysis and hydroxide precipitation. A process using formaldehyde as reducing agent to reduce and precipitate copper has been reported abroad. A new method using sodium hyposulfite as reducer is suggested, whch is added into the acidic Gu-plating waste water to reduce Cu~+ ion into metallic copper, which would precipitate and can be recovered by filtering. Any excess of sodium hyposulfite and sulf...
In this study, We have chosen a new reducing agent by reserching thechemical reactions of thedichromate with different reducing agents, andtesting of modified two bath chrome tannage process. The new reducingagent can be used to solve the important problem in modified two bathtannage.we have also taken a comparison test in process between sodium hyposulfite and sodium pyrosulfite——chosen reducing agent.
The producing technology of fruit bromelain was presented in this paper. The results indicated that the suitable concentration of tannic acid to precipitate the bromelain was 0. 08 ~ 0. 1 %, such concentration could take account of both yield and quality of fruit bromelain. To freeze the enzyme cake below -12℃ and to dry the enzyme cake through vacuum desiccation could raise the enzyme activities greatly. It was discovered that 1000 μg/g of sodium hyposulfite plus 62. 5 μg/g of cysteine was an effecti...