Disclosed is a method for preparing a double end capped glycol ether, the method comprising: introducing into a reactor a raw material comprising a glycol monoether and a monohydric alcohol ether, and enabling the raw material to contact and react with an acidic molecular sieve catalyst to generate a double end capped glycol ether, a reaction temperature being 50-300° C., a reaction pressure being 0.1-15 MPa, a WHSV of the glycol monoether in the raw material being 0.01-15.0 h.sup.−1, and a mole ratio of the monohydric alcohol ether to the glycol monoether in the raw material being 1-100:1. The method of the present invention enables a long single-pass lifespan of the catalyst and repeated regeneration, has a high yield and selectivity of a target product, low energy consumption during separation of the product, a high economic value of a by-product, and is flexible in production scale and application.

A surfactant of structure (I) is useful as a biodegradable low foaming surfactant: where m is a value in a range of 3 to 10, n is a value in a range of 5 to 20 and z is a value in a range of 10 to 25.

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A surfactant of structure (I) is useful as a biodegradable low foaming surfactant: where m is a value in a range of 3 to 10, n is a value in a range of 5 to 20 and z is a value in a range of 10 to 25.

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A method for preparing methyl formate in which a raw material containing formaldehyde, methanol and/or dimethyl ether is introduced into a first reaction zone to come into contact with a catalyst A, and a component I is obtained by separation, the component I is introduced into a second reaction zone to come into contact with a catalyst B so as to obtain, by separation, methyl formate as a product, dimethyl ether that is returned to the first reaction zone and a component II that is returned to the second reaction zone, the catalysts have a long service life, the reaction conditions are mild, and the utilization rate of the raw material is high, thus enabling a continuous production for large-scale industrial application.

Precipitation promoters, which are an organic compound having one or more linear aliphatic hydrocarbon groups having not less than 10 carbon atoms, wherein the aliphatic hydrocarbon group has not less than 20 carbon atoms in total are useful for precipitating an organic compound protected by an organic group having one or more aliphatic hydrocarbon groups having not less than 10 carbon atoms from a solvent.

Precipitation promoters, which are an organic compound having one or more linear aliphatic hydrocarbon groups having not less than 10 carbon atoms, wherein the aliphatic hydrocarbon group has not less than 20 carbon atoms in total are useful for precipitating an organic compound protected by an organic group having one or more aliphatic hydrocarbon groups having not less than 10 carbon atoms from a solvent.

A quantum dot composition includes a quantum dot, and a ligand bonded to a surface of the quantum dot, wherein the ligand includes a head portion bonded to the surface of the quantum dot and containing a polar solvent dissociative functional group, and a tail portion connected to the head portion. A quantum dot composition according to an embodiment is used to form an emission layer of a light emitting element to enhance luminous efficiency of the light emitting element including an emission layer formed through the quantum dot composition.

A quantum dot composition includes a quantum dot, and a ligand bonded to a surface of the quantum dot, wherein the ligand includes a head portion bonded to the surface of the quantum dot and containing a polar solvent dissociative functional group, and a tail portion connected to the head portion. A quantum dot composition according to an embodiment is used to form an emission layer of a light emitting element to enhance luminous efficiency of the light emitting element including an emission layer formed through the quantum dot composition.

(Object) An object is to suppress the peeling and lamination misalignment of ceramic green sheets without deteriorating the sheet strength.

(Solution) A ceramic green sheet lamination aid comprising a compound represented by formula (1).

Z—[O-(AO)n-H]x  (1) (Z represents a residual group of a compound having a number of carbons group of 1 to 22 and having hydroxyl groups of 1 to 6 in which all of said hydroxyl groups are removed; x represents a number of 1 to 6; AO represents an oxyalkylene group having a number of carbons of 2 to 4; n represents a number of 5 to 500; x×n is in a range of 5 to 500; and a weight ratio of oxyethylene group EO contained in the oxyalkylene group AO having the number of carbons of 2 to 4 is 0 to 80 weight %.)

(Object) An object is to suppress the peeling and lamination misalignment of ceramic green sheets without deteriorating the sheet strength.

(Solution) A ceramic green sheet lamination aid comprising a compound represented by formula (1).

Z—[O-(AO)n-H]x  (1) (Z represents a residual group of a compound having a number of carbons group of 1 to 22 and having hydroxyl groups of 1 to 6 in which all of said hydroxyl groups are removed; x represents a number of 1 to 6; AO represents an oxyalkylene group having a number of carbons of 2 to 4; n represents a number of 5 to 500; x×n is in a range of 5 to 500; and a weight ratio of oxyethylene group EO contained in the oxyalkylene group AO having the number of carbons of 2 to 4 is 0 to 80 weight %.)