The method of production of synthetic tanning agent pca

 

(57) Abstract:

The method relates to a process for the production of synthetic tanning agent (sintanol) used in tanneries. Synthetic tanning agent SPS receive joint condensation of shale phenols, formaldehyde and lignosulfonate, followed by dispersing the obtained resin in the same lignosulfonate. Pre-shale phenols mix the lignosulfonate in the presence of 3-5% sulfuric acid for 1 h at 40C. to a pH of 2.0 to 2.5. The resulting mass is subjected to polycondensation with the gradual introduction of 5.5% formaldehyde and stirred at 45-52C, kept at this temperature for 1 h the Resulting resin was dispersed in the same lignosulfonate, pre-heated to 40-50C. the Mixture is heated to 85-95C, stirred at this temperature for 4.5 h, the liquid tanning agent is evaporated. Cut up and packaged. Using the proposed method allows to reduce the content of free phenol in the finished product up to 0.5% and to maintain the rate of benign level known tannins.

The invention relates to the technology for synthetic tanning agent (sintanol) used in tanneries.

the th raw [Levenko P. I. The impact of the use of chemicals to increase production efficiency and quality leather. - M: Light industry, 1979. - S. 104-105, 109 S.].

Thus obtained Syntan is composed of free unreacted phenol, which is in the process of tanning leather is emitted into the atmosphere and waste water that requires additional cleaning costs and waste disposal.

Closest to the claimed method is synthetic tanning agent from phenols that are included with water thermal processing of oil shale-based joint condensation of these phenols with formaldehyde and lignosulfonic acids; the resulting resin constituting the amorphous mass of Golden color, dispersed in the same lignosulphonic acids, which are used for manufacturing lignieresii resin [Mikhailov A. N. and other Synthetic tannins.- M: Light industry, 1967. - S. 133].

The disadvantage of this method is that the resulting tanning agent contains up to 5% of free unreacted phenol, which is in the process of tanning leather is emitted into the atmosphere and waste water that requires additional cleaning costs and waste disposal.

The task of the invention is to reduce codeamber.org mode of condensation.

This object is achieved in that the synthetic tanning agent SPS receive joint condensation of shale phenols, formaldehyde and lignosulfonate, followed by dispersing the obtained resin in the same lignosulfonate, and pre-shale phenols mix with lignosulfonate in the presence of 3-5% sulfuric acid for 1 h at 40oC to pH 2.0 to 2.5, the resulting mass is subjected to polycondensation with the gradual introduction of 5.5% formaldehyde and stirred at 45-52oC, kept at this temperature for 1 h, the resulting resin was dispersed in the same lignosulfonate, pre-heated to 40-50oC, the mixture is heated to 85-95oC, stirred at this temperature for 4.5 h, the liquid tanning agent is evaporated. Cut up and packaged. For synthetic tanning agent of the PCA with the indicators of benign level known tannins, the optimal technological parameters of the process.

In the process of getting this tanning agent reduced content of free unreacted phenol in the finished product up to 0.5% due to selection of the ratio of phenol: formaldehyde and an optimum temperature mode condense sdaetsa example of a synthetic tanning agent SPS.

In the apparatus (6 m3) download 600 kg of oil shale phenols and 1100 kg of lignosulfonate, stirred, and acidified with 3-5% sulfuric acid at 40oC in the amount of 24 kg per hour until a pH of 2-2 .5. The resulting mass is subjected to polycondensation with the gradual introduction of 5.5% formaldehyde in number 84 l from the original weight of phenol, stirred at 45-52oC, kept at this temperature for 1 h

The resulting resin was dispersed in the same lignosulfonate in the number 3890 kg, pre-heated to 40-50oC, the mixture is heated to 85-95oC, stirred at this temperature for 4.5 hours Liquid tanning agent is evaporated. Cut up and packaged.

The use of the proposed method will allow you to:

to reduce the content of free phenol in the finished product up to 0.5% due to selection of the ratio of phenol:formaldehyde and optimal temperature regime of condensation;

- save indicator of high quality at the level known tannins.

The method of production of synthetic tanning agent CPF joint condensation of shale phenols, formaldehyde and lignosulfonate, followed by dispersing the obtained resin in the same lignosulfonate, wherein the shale F. the percent mass is subjected to polycondensation with the gradual introduction of 5.5% formaldehyde, stirred at 45-52C, kept at this temperature for 1 h, the resulting resin is dispersed in pre-heated to 40-50With the lignosulfonate, the mixture is heated to 85-95C, stirred at this temperature for 4.5 h, the finished tanning agent is evaporated.

 

Same patents:
The invention relates to the technology for synthetic tanning agent (sintanol) used in leather production
The invention relates to the technology for synthetic tanning agent (sintanol) used in leather production

The invention relates to light industry, namely, fur production, and can be used for tanning of fur and fur skins
The invention relates to the production of the tanning agent used in the production of leather and fur
The invention relates to the production of the tanning agent used in the production of leather and fur

The invention relates to the leather industry, in particular, for dyeing and greasing processes, and can be used in making leather for Shoe uppers from raw cattle

The invention relates to chemical treatment of skins, and tanned hides, and is intended for use in the leather industry for tanning skins from Astrakhan, sheepskin, goat and other skins
The invention relates to the technology for synthetic tanning agent (sintanol) used in leather production

The invention relates to the leather industry and can be used in making leather for various purposes, including white and bright skin
The invention relates to the technology for synthetic tanning agent (sintanol) used in leather production

The invention relates to the leather industry and can be used in making leather for various purposes, including white and bright skin

The invention relates to the leather industry, and can be used in making leather for various purposes

The invention relates to the leather industry, in particular, to the tanning with the use of the products of polycondensation, and can be used in making leather for Shoe uppers bright colors

The invention relates to the leather industry, in particular to the tanning with the use of the products of polycondensation, and can be used in making leather for Shoe uppers bright colors
The invention relates to the technology for synthetic tanning agent (sintanol) used in leather production
Up!