The present invention provides a method for producing a reduction reaction product, wherein recovery of the reaction solvent and/or distillation is carried out after adding a nitrogen-containing compound into a reaction liquid of a reduction reaction that has been conducted using a transition metal complex. The present invention is capable of suppressing decrease in the optical purity of the reduction reaction product due to the transition metal complex used as a catalyst.

The present invention provides a method for producing a reduction reaction product, wherein recovery of the reaction solvent and/or distillation is carried out after adding a nitrogen-containing compound into a reaction liquid of a reduction reaction that has been conducted using a transition metal complex. The present invention is capable of suppressing decrease in the optical purity of the reduction reaction product due to the transition metal complex used as a catalyst.

A MEG stream having a first pH level is contacted with a CO.sub.2-rich gas stream to yield a MEG product having a second different and lower pH level. The system and method can be readily incorporated into a slipstream MEG recovery package, with a source of the MEG stream being a MEG regeneration section of the package. The CO.sub.2-rich gas could be a vented CO.sub.2 stream from the MEG reclamation section of the package. Unlike hydrochloric and acetic acid overdosing, CO.sub.2 overdosing of the lean MEG stream does not lead to rapid acidification of the MEG product to be stored or injected.

A MEG stream having a first pH level is contacted with a CO.sub.2-rich gas stream to yield a MEG product having a second different and lower pH level. The system and method can be readily incorporated into a slipstream MEG recovery package, with a source of the MEG stream being a MEG regeneration section of the package. The CO.sub.2-rich gas could be a vented CO.sub.2 stream from the MEG reclamation section of the package. Unlike hydrochloric and acetic acid overdosing, CO.sub.2 overdosing of the lean MEG stream does not lead to rapid acidification of the MEG product to be stored or injected.

A MEG stream having a first pH level is contacted with a CO.sub.2-rich gas stream to yield a MEG product having a second different and lower pH level. The system and method can be readily incorporated into a slipstream MEG recovery package, with a source of the MEG stream being a MEG regeneration section of the package. The CO.sub.2-rich gas could be a vented CO.sub.2 stream from the MEG reclamation section of the package. Unlike hydrochloric and acetic acid overdosing, CO.sub.2 overdosing of the lean MEG stream does not lead to rapid acidification of the MEG product to be stored or injected.

The present invention discloses a process for depolymerization of lignin to yield substituted phenolic monomers using Brnsted ionic liquid as catalyst under mild reaction conditions to obtain an overall yield of monomers up to 97%.

The present invention discloses a process for depolymerization of lignin to yield substituted phenolic monomers using Brnsted ionic liquid as catalyst under mild reaction conditions to obtain an overall yield of monomers up to 97%.

Provided herein is a method for generating a glycerol-based scale inhibitor and utilizing it to generate a glycerol-based scale inhibitor solution. The method includes providing a glycerol feed and a scale-inhibiting precursor to generate the glycerol-based scale inhibitor. Further, the method includes providing one or more additives to the one or more glycerol-based scale inhibitor, thereby generating a glycerol-based scale inhibitor solution.

Provided herein is a method for generating a glycerol-based scale inhibitor and utilizing it to generate a glycerol-based scale inhibitor solution. The method includes providing a glycerol feed and a scale-inhibiting precursor to generate the glycerol-based scale inhibitor. Further, the method includes providing one or more additives to the one or more glycerol-based scale inhibitor, thereby generating a glycerol-based scale inhibitor solution.

The present invention provides a method for improving ultra-violet light transmittance of ethylene glycol, which includes the following steps: (1) subjecting ethylene glycol, a catalyst and water to a hydrolysis reaction at 120 C.-150 C.; and (2) adding a stabilizer into a product of the hydrolysis reaction, then conducting distillation at reduced pressure, and condensing to recover a fraction. The method of the present invention can effectively decompose impurities of carboxyl-, conjugated double bond-, aldehyde and ketone-containing complex organic compounds in the ethylene glycol which affect the ultra-violet light transmittance, obviously improve UV values of the ethylene glycol at 220 nm, 275 nm and 350 nm, give consideration to the requirements of environmental protection and safety and economic benefits, and have a broad application prospect.