CN102010917A - Ammonia nitrogen-free leather-making deliming agent and preparation method thereof - Google Patents

Abstract

The invention discloses an ammonia nitrogen-free leather-making deliming agent and a preparation method thereof. The method comprises the following steps of: mixing 60 to 80 mass parts of organic acid A, 15 to 30 mass parts of organic acid B and 5 to 30 mass parts of inorganic salt; and mechanically crushing until the granularity is 80 to 100 meshes, adding 1 to 10 mass parts of aids and uniformly mixing to obtain the ammonia nitrogen-free leather-making deliming agent. The deliming agent does not contain ammonia nitrogen materials, the ammonia nitrogen content of the waste liquid and chemical oxygen demand (COD) content after deliming are respectively reduced by over 80 percent and 20 percent compared with those of the conventional process, no irritant gas is generated in the deliming process, safety production of an operator is facilitated, and the deliming agent is a clean leather-making aid, and has great popularization and application prospect.

Description

A kind of no ammonia nitrogen process hides deliming agent and preparation method thereof

Technical field

The invention belongs to the production of leather chemicals, be specifically related to a kind of no ammonia nitrogen process hides deliming agent and preparation method thereof.

Background technology

The Economic development of China recent years is rapid, and economic total volume occupies prostatitis, the world, but the fast-developing pattern of concentrating on economic growth has been brought a series of problem of environmental pollution.In industrial production is polluted, wherein maximum, the social repercussion of harm the most the pollution problem, the especially water that bring no more than industrial production of intensive pollute.The data presentation of State Environmental Protection Administration, since white 2005 " pollution of preserved egg river " incidents, relevant with water together pollution incident just takes place in the average every couple of days of China.The Chinese environmental situation allows of no optimist, the pollution incident of China's generation now, and 70 percent is that water pollutes, and illustrates that obviously water pollution problems is quite serious.Leather industry has also caused certain pollution to environment when producing tremendous economic, social benefit, the pollution of leather industry mainly results from the process hides process.The above leather-making enterprises of the existing scale of China more than 2900 is tame, and 1.2 hundred million tons of annual sewage effluents (be about national industrial discharge waste water 0.5%) wherein contain 250,000 tons of COD (be about national industrial discharge COD 5%), 10,000 tons in sulfide, 150,000 tons of suspended substances.

Tanning sewage is almost all from the wet course of processing of process hides, in immersion, degreasing, liming, deliming, softening, pickling, tanning, retanning, dye, add in the wet manufacturing procedure of wet goods, deliming with softening be the main source that produces ammonia nitrogen.Deliming processing is with the lime in the liming pelt and alkali is some or all of removes, and purpose is in order to eliminate the swelling state of grey pelt, to regulate pH value, for soften, operations such as pickling and tanning create conditions.The simplest deashing method is used vexed water washing exactly, this method is removed free ash alkali between dedust pelt undissolved lime in surface and fiber easily, but the grey alkali that is adsorbed by the collegen filament capillary pore difficulty washes out, so will carry out chemical deliming usually behind the washing deliming.

Chemical deliming is exactly to utilize the neutralization reaction of deliming agent and grey alkali to slough grey alkali.The ideal deliming agent is the alkali in the skin of neutralizing, and the pH value of solution value is cushioned within the specific limits, can also make calcium salt generate soluble salt.

Deliming agent commonly used has ammonium salt deliming agent (bicarbonate of ammonia, ammonium chloride, ammonium sulfate etc.) and acids deliming agent (hydrochloric acid, sulfuric acid, formic acid, lactic acid etc.), ammonium salt deliming agent major advantage is to form buffering system, the deliming process relaxes, evenly, cost is low, it is softening to be fit to pancreatin.The price of ammonium salt deliming agent is lower, stable performance, but the deliming process has ammonia to discharge, meeting stimulation applications personnel's respiratory system, contain a large amount of ammonia and nitrogen components in the waste water simultaneously, cause the ammonia nitrogen index severe overweight of waste water, so use the organic acid deliming agent of no ammonia nitrogen will become the direction that the process hides deliming cleans.

The key of organic acid deliming agent is that organic acid is reasonably combined, adjusts the degree of depth and the speed of deliming, and will prevent the generation of hydrogen sulfide in the deliming process.

Summary of the invention

The object of the present invention is to provide a kind of no ammonia nitrogen process hides deliming agent and preparation method thereof, do not contain the ammonia nitrogen material in the component of this deliming agent, waste liquid ammonia-nitrogen content behind the deliming reduces more than 80% than common process, COD content reduces more than 20%, deliming process nonirritant gas produces, and helps operator safety production.

For achieving the above object, no ammonia nitrogen process hides deliming agent of the present invention contains 60～80 parts organic acid A, 15～30 parts organic acid B, 5～30 parts inorganic salt and 1～10 part auxiliary agent by mass fraction.

Preparation method of the present invention is: after the inorganic salt of getting 60～80 parts organic acid A, 15～30 parts organic acid B and 5～30 parts by mass fraction mix, add 1～10 part auxiliary agent behind mechanical disintegration to 80～100 orders again and mix and obtain not having ammonia nitrogen process hides deliming agent;

Described organic acid A is citric acid, Succinic Acid, pentanedioic acid, nylon acid or propanedioic acid;

Organic acid B is gluconic acid or sulphosalicylic acid;

Inorganic salt are sodium pyrosulfate, Sulfothiorine or S-WAT;

Auxiliary agent is manganous sulfate, manganese acetate or Manganous chloride tetrahydrate.

The present invention has the following advantages:

(1) product processing and preparing process is simple, and energy consumption is low, three-waste free discharge;

(2) raw material does not contain the ammonia nitrogen material, and the deliming process greatly reduces ammonia-nitrogen content and the COD content in the waste liquid, has alleviated the pollution in wet process segment of process hides greatly;

(3) the deliming efficient of product is higher, and more traditional deliming agent ammonium sulfate deliming process more relaxes, and the effect of clean grain is arranged;

(4) the deliming process does not have ammonia and hydrogen sulfide release, and operational safety is convenient to operator's operation.

Embodiment

Embodiment 1: after the sodium pyrosulfate of getting 60 parts citric acid, 15 parts gluconic acid and 5 parts by mass fraction mixes, add 1 part manganous sulfate behind mechanical disintegration to 80～100 orders again and mix and obtain not having ammonia nitrogen process hides deliming agent.

Embodiment 2: after the Sulfothiorine of getting 70 parts Succinic Acid, 23 parts sulphosalicylic acid and 18 parts by mass fraction mixes, add 5 parts manganese acetate behind mechanical disintegration to 80～100 orders again and mix and obtain not having ammonia nitrogen process hides deliming agent.

Embodiment 3: after the S-WAT of getting 80 parts pentanedioic acid, 30 parts gluconic acid and 30 parts by mass fraction mixes, add 10 parts Manganous chloride tetrahydrate behind mechanical disintegration to 80～100 orders again and mix and obtain not having ammonia nitrogen process hides deliming agent.

Embodiment 4: after the sodium pyrosulfate of getting 65 parts nylon acid, 20 parts sulphosalicylic acid and 10 parts by mass fraction mixes, add 3 parts manganous sulfate behind mechanical disintegration to 80～100 orders again and mix and obtain not having ammonia nitrogen process hides deliming agent.

Embodiment 5: after the Sulfothiorine of getting 75 parts propanedioic acid, 25 parts gluconic acid and 25 parts by mass fraction mixes, add 8 parts Manganous chloride tetrahydrate behind mechanical disintegration to 80～100 orders again and mix and obtain not having ammonia nitrogen process hides deliming agent.

Claims (2)

1. a no ammonia nitrogen process hides deliming agent is characterized in that: contain 60～80 parts organic acid A, 15～30 parts organic acid B, 5～30 parts inorganic salt and 1～10 part auxiliary agent by mass fraction;

Described organic acid A is citric acid, Succinic Acid, pentanedioic acid, nylon acid or propanedioic acid;

Organic acid B is gluconic acid or sulphosalicylic acid;

Inorganic salt are sodium pyrosulfate, Sulfothiorine or S-WAT;

Auxiliary agent is manganous sulfate, manganese acetate or Manganous chloride tetrahydrate.

2. the preparation method of a no ammonia nitrogen process hides deliming agent as claimed in claim 1, it is characterized in that: after the inorganic salt of getting 60～80 parts organic acid A, 15～30 parts organic acid B and 5～30 parts by mass fraction mix, add 1～10 part auxiliary agent behind mechanical disintegration to 80～100 orders again and mix and obtain not having ammonia nitrogen process hides deliming agent;

Described organic acid A is citric acid, Succinic Acid, pentanedioic acid, nylon acid or propanedioic acid;

Organic acid B is gluconic acid or sulphosalicylic acid;

Inorganic salt are sodium pyrosulfate, Sulfothiorine or S-WAT;

Auxiliary agent is manganous sulfate, manganese acetate or Manganous chloride tetrahydrate.