Provided is a method for manufacturing a glycol based compound. The method comprises agitating a mixture of a first glycol based compound, a hydrazide based compound, and a sulfonic acid based compound, and performing fractional distillation of resultant materials of the agitating to recover a second glycol based compound having a formaldehyde content of 0 ppm.

Provided is a method for manufacturing a glycol based compound. The method comprises agitating a mixture of a first glycol based compound, a hydrazide based compound, and a sulfonic acid based compound, and performing fractional distillation of resultant materials of the agitating to recover a second glycol based compound having a formaldehyde content of 0 ppm.

Provided is a method for manufacturing a glycol based compound. The method comprises agitating a mixture of a first glycol based compound, a hydrazide based compound, and a sulfonic acid based compound, and performing fractional distillation of resultant materials of the agitating to recover a second glycol based compound having a formaldehyde content of 0 ppm.

Provided are a method and an apparatus for recovering (meth)acrylic acid. The recovering method is used to save the energy required for a process of recovering (meth)acrylic acid because a process of separating high-boiling point by-products can be omitted, and to minimize a possibility of (meth)acrylic acid polymerization during the process of recovering (meth)acrylic acid. Therefore, the recovering method is used to obtain (meth)acrylic acid with less energy in a high yield.

Provided are a method and an apparatus for recovering (meth)acrylic acid. The recovering method is used to save the energy required for a process of recovering (meth)acrylic acid because a process of separating high-boiling point by-products can be omitted, and to minimize a possibility of (meth)acrylic acid polymerization during the process of recovering (meth)acrylic acid. Therefore, the recovering method is used to obtain (meth)acrylic acid with less energy in a high yield.

Provided is a method to reduce allyl group-containing impurities in an oxypropylene group-containing glycol ether using a relatively easy and simple industrial facility and reaction process, to enable the hydrosilylation reaction products and oxypropylene group-containing glycol ether to be easily separated by distillation, or the like, to prevent the oxypropylene group-containing glycol ether from adversely affecting the polymerization reaction when used as a reaction solvent or diluent for polyether-polysiloxane block copolymers, and to easily produce the oxypropylene group-containing glycol ether at low cost. A method for producing oxypropylene group-containing glycol ethers, comprises a step of inducing a hydrosilylation reaction of an allyl group-containing impurity included in an oxypropylene group-containing glycol ether and a silicon atom-bonded hydrogen atom (SiH)-containing compound. Optionally, an additional purification step is utilized for separating the oxypropylene group-containing glycol ether by distillation or the like.

Provided is a method to reduce allyl group-containing impurities in an oxypropylene group-containing glycol ether using a relatively easy and simple industrial facility and reaction process, to enable the hydrosilylation reaction products and oxypropylene group-containing glycol ether to be easily separated by distillation, or the like, to prevent the oxypropylene group-containing glycol ether from adversely affecting the polymerization reaction when used as a reaction solvent or diluent for polyether-polysiloxane block copolymers, and to easily produce the oxypropylene group-containing glycol ether at low cost. A method for producing oxypropylene group-containing glycol ethers, comprises a step of inducing a hydrosilylation reaction of an allyl group-containing impurity included in an oxypropylene group-containing glycol ether and a silicon atom-bonded hydrogen atom (SiH)-containing compound. Optionally, an additional purification step is utilized for separating the oxypropylene group-containing glycol ether by distillation or the like.

A composition comprises a polyol and a polyethylenimine compound. A method for reducing the volatile aldehyde content of a polyol comprises the steps of: (a) providing a polyol, the polyol containing a first amount of volatile aldehyde compounds; (b) providing a polyethylenimine compound; and (c) adding the polyethylenimine compound to the polyol to produce a composition.

A composition comprises a polyol and a polyethylenimine compound. A method for reducing the volatile aldehyde content of a polyol comprises the steps of: (a) providing a polyol, the polyol containing a first amount of volatile aldehyde compounds; (b) providing a polyethylenimine compound; and (c) adding the polyethylenimine compound to the polyol to produce a composition.

With respect to reduced coenzyme Q10, there has been no report about the presence of crystal polymorphism, and it has been considered that a conventionally obtained crystal form is only one form. The present invention relates to a reduced coenzyme Q10 crystal having an endothermic peak indicating melting at 542 C. during temperature rise at a rate of 5 C./min by differential scanning calorimetry (DSC), and/or to a reduced coenzyme Q10 crystal showing characteristic peaks at diffraction angles (20.2) of 11.5, 18.2, 19.3, 22.3, 23.0 and 33.3 by powder X-ray (CuK) diffraction. The crystal form is a novel reduced coenzyme Q10 crystal which has a higher melting point and a lower solubility in a solvent, and is more excellent in stability than the conventionally known reduced coenzyme Q10 crystal.