Thiourea Dioxide vs Sodium Hydrosulphite

 Dasteck     |      2019-07-31 15:06:53

1. THIOUREA DIOXIDE has the following features and benefits:

  •  does not result in flammability problems in contact with moisture as compared to traditional hydrosulfite based reducing agents

  •  has good heat resistance stability, and its decomposition rate is milder than that of SHS even in a high temperature (80-100C), exhibits good storage stability

  •  is very economical in use compared to traditional hydrosulfite based reducing agents (may generally be used at 1/4 to 1/5th addition rate)

  •  fully biodegradable, protect environment with no pollution.

  •  may be used in stripping, clearing and cleaning processes associated with most dye classes.

  •  high reduction potential (-1340mV), economic and high efficient.

  •  High thermal stability made the dyeing process easy to control and avoided the effluent problems associated with sodium hydrosulfite, lighter injury to fiber and less fiber loss.

  •  no sulfurous odors. On the contrary, after decomposition of SHS, a large amount of irritating gas will be released, which seriously affects the production environment.

2. The highest reduction potential of Sodium Hydrosulfite is -1080mV, and the highest reduction potential of TD under the same condition is -1340mV, which is -260mV higher. The difference in the critical amount of each of these reduction potentials is even more pronounced, with Sodium Hydrosulfite 85% requiring 15g/l and TD 99% requiring only 5g/l. For reaching the reduction potential -1080mV of Sodium Hydrosulfite, TD 99%'s dosage is just 0.25g/l.