Method for recycling peptizer DBD from peptizer DBD waste

Abstract

The invention provides a method for recycling a peptizer DBD from peptizer DBD waste, which comprises the following steps: mixing the peptizer DBD waste with trichloromethane, dissolving, and filtering to obtain a solution; performing solvent evaporation on the solution to obtain a solid substance; and mixing the solid substance with toluene, and then filtering to obtain the peptizer DBD. According to the method, trichloromethane is adopted to dissolve organic matters and a peptizer DBD in the peptizer waste, and inorganic salts and other insoluble impurities in the peptizer waste are removed through filtration; through solvent evaporation, most of raw materials and byproducts for preparing the peptizer DBD can be removed, and a solid substance containing a large amount of peptizer DBD is obtained; and finally, the solid substances are washed with methylbenzene, other organic matter impurities are extracted out, the solid peptizer DBD is obtained, and therefore the purpose of recycling the peptizer DBD from the peptizer DBD waste is achieved.

Description

technical field

[0001] The invention belongs to the technical field of peptizer synthesis, and in particular relates to a method for recovering peptizer DBD from peptizer DBD waste. Background technique

[0002] The peptizer DBD (2,2'-dibenzamidodiphenyl disulfide) is generally applied to rubber, which can reduce the molecular weight of rubber, shorten the time of mastication, reduce energy consumption, and improve production efficiency.

[0003] At present, the synthesis method of peptizer DBD can be divided into two categories: one is through the hydrolysis of benzothiazole; Ammonium and sodium bisulphate etc. react to prepare the target product, the total yield of peptizer DBD only has 85~90% in these two kinds of synthetic methods, wherein has the peptizer DBD about 5~10% to be in washing, centrifugation process along with As the solvent enters the follow-up distillation system for solvent recycling, 5-10% of the peptizer DBD will eventually enter the waste and cannot b...

Examples

Embodiment 1

[0042] The method for reclaiming peptizer DBD from peptizer DBD waste, is the following steps:

[0043] (1) Add 100g of peptizer DBD waste into a 1000mL beaker, add 500mL of chloroform to stir, and suction filter to obtain the solution; wherein, the stirring time is 60min, and the temperature is 20°C;

[0044] (2) Evaporate the solvent from the solution obtained in the step (1) until no fraction appears to obtain a solid substance; wherein, the temperature for solvent evaporation is 80° C.;

[0045] (3) Adopt 100mL toluene to mix with solid matter twice, carry out washing and suction filtration, obtain peptizer DBD after drying; Wherein, the temperature of described drying is 80 ℃; The quality of toluene is 10% of solid matter mass.

Embodiment 2

[0047] The method for reclaiming peptizer DBD from peptizer DBD waste, is the following steps:

[0048] (1) Add 100g of peptizer DBD waste into a 1000mL beaker, add 1000mL of chloroform to stir, and suction filter to obtain the solution; wherein, the stirring time is 60min, and the temperature is 20°C;

[0049] (2) Evaporate the solvent from the solution obtained in the step (1) until no fraction appears to obtain a solid substance; wherein, the temperature for solvent evaporation is 80° C.;

[0050] (3) Adopt 200mL toluene to mix with solid substance twice, carry out washing and suction filtration, obtain peptizer DBD after drying; Wherein, the temperature of described drying is 80 ℃; The quality of toluene is 10% of solid substance quality.

Embodiment 3

[0052] The method for reclaiming peptizer DBD from peptizer DBD waste, is the following steps:

[0053] (1) Add 500g of peptizer DBD waste into a 1000mL beaker, add 2500mL of chloroform to stir, and suction filter to obtain the solution; wherein, the stirring time is 60min, and the temperature is 20°C;

[0054] (2) Evaporate the solvent from the solution obtained in the step (1) until no fraction appears to obtain a solid substance; wherein, the temperature for solvent evaporation is 80° C.;

[0055] (3) Adopt 500mL toluene to mix with solid substance twice, carry out washing and suction filtration, obtain peptizer DBD after drying; Wherein, the temperature of described drying is 80 ℃; The quality of toluene is 10% of solid substance quality.

technical field

[0001] The invention belongs to the technical field of peptizer synthesis, and in particular relates to a method for recovering peptizer DBD from peptizer DBD waste. Background technique

[0002] The peptizer DBD (2,2'-dibenzamidodiphenyl disulfide) is generally applied to rubber, which can reduce the molecular weight of rubber, shorten the time of mastication, reduce energy consumption, and improve production efficiency.

[0003] At present, the synthesis method of peptizer DBD can be divided into two categories: one is through the hydrolysis of benzothiazole; Ammonium and sodium bisulphate etc. react to prepare the target product, the total yield of peptizer DBD only has 85~90% in these two kinds of synthetic methods, wherein has the peptizer DBD about 5~10% to be in washing, centrifugation process along with As the solvent enters the follow-up distillation system for solvent recycling, 5-10% of the peptizer DBD will eventually enter the waste and cannot b...

Examples

Embodiment 1

[0042] The method for reclaiming peptizer DBD from peptizer DBD waste, is the following steps:

[0043] (1) Add 100g of peptizer DBD waste into a 1000mL beaker, add 500mL of chloroform to stir, and suction filter to obtain the solution; wherein, the stirring time is 60min, and the temperature is 20°C;

[0044] (2) Evaporate the solvent from the solution obtained in the step (1) until no fraction appears to obtain a solid substance; wherein, the temperature for solvent evaporation is 80° C.;

[0045] (3) Adopt 100mL toluene to mix with solid matter twice, carry out washing and suction filtration, obtain peptizer DBD after drying; Wherein, the temperature of described drying is 80 ℃; The quality of toluene is 10% of solid matter mass.

Embodiment 2

[0047] The method for reclaiming peptizer DBD from peptizer DBD waste, is the following steps:

[0048] (1) Add 100g of peptizer DBD waste into a 1000mL beaker, add 1000mL of chloroform to stir, and suction filter to obtain the solution; wherein, the stirring time is 60min, and the temperature is 20°C;

[0049] (2) Evaporate the solvent from the solution obtained in the step (1) until no fraction appears to obtain a solid substance; wherein, the temperature for solvent evaporation is 80° C.;

[0050] (3) Adopt 200mL toluene to mix with solid substance twice, carry out washing and suction filtration, obtain peptizer DBD after drying; Wherein, the temperature of described drying is 80 ℃; The quality of toluene is 10% of solid substance quality.

Embodiment 3

[0052] The method for reclaiming peptizer DBD from peptizer DBD waste, is the following steps:

[0053] (1) Add 500g of peptizer DBD waste into a 1000mL beaker, add 2500mL of chloroform to stir, and suction filter to obtain the solution; wherein, the stirring time is 60min, and the temperature is 20°C;

[0054] (2) Evaporate the solvent from the solution obtained in the step (1) until no fraction appears to obtain a solid substance; wherein, the temperature for solvent evaporation is 80° C.;

[0055] (3) Adopt 500mL toluene to mix with solid substance twice, carry out washing and suction filtration, obtain peptizer DBD after drying; Wherein, the temperature of described drying is 80 ℃; The quality of toluene is 10% of solid substance quality.