CN111454147A

CN111454147A - Treatment process and equipment for hazardous waste activated carbon for production of stearic acid acyl chloride

Info

Publication number: CN111454147A
Application number: CN202010372853.3A
Authority: CN
Inventors: 杨全文; 王杨; 张宏; 阎宏磊
Original assignee: Shandong Bohong New Chemical Technology Co ltd
Current assignee: Shandong Bohong New Chemical Technology Co ltd
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2020-07-28

Abstract

The invention belongs to the field of waste chemical treatment, and particularly relates to a treatment process and equipment for dangerous waste activated carbon for producing stearoyl chloride, wherein more than 95% of products in the waste activated carbon can be recovered by performing filter pressing and drying on an activated carbon suspension treated by a Fente filter, so that the yield and project income of the products are greatly improved, and the waste of resources is avoided.

Description

Treatment process and equipment for hazardous waste activated carbon for production of stearic acid acyl chloride

Technical Field

The invention belongs to the field of waste chemical treatment, and particularly relates to a treatment process and equipment for hazardous waste activated carbon for production of stearoyl chloride.

Background

Stearic acid acyl chloride, also known as octadecanoyl chloride, has the following uses: as intermediates for color cinematographic film couplers (e.g., 535, 577, 169, 133, etc.), for the production of amide anhydrides, etc., as starting materials for the synthesis of esters of alcohols and other organic compounds, for the production of neutral sizing agents AKD (alkyl ketene dimers) for papermaking.

Stearic acid chloride (octadecanoyl chloride) has been popularized in recent decades, and its market usage has increased year by year. The final step of the production process of the stearic acid acyl chloride product is activated carbon decoloration and filtration, and a full-automatic Fente filter is adopted, so that the full-automatic continuous production can be realized by the filter, and the production of mass products is met. However, by adopting the existing process and filtering equipment, the filter cake filtered by the FilterNet filter contains a large amount of products and solvents, the discharged waste activated carbon is in a suspension state, the amount of dangerous waste is greatly increased, and the treatment cost of the dangerous waste is increased, because the activated carbon contains a large amount of stearic acid acyl chloride and DMF (dimethyl formamide) accounting for 50-60 percent, namely more than 500 tons, the waste is greatly caused, the amount of the dangerous waste is increased, the treatment cost of the dangerous waste is increased, and the annual loss is about 1000 ten thousand.

Disclosure of Invention

In order to overcome the problems, the first object of the invention is to provide a treatment process for hazardous waste activated carbon in stearic acid acyl chloride production, wherein more than 95% of the products in the waste activated carbon can be recovered by performing filter pressing and drying on the activated carbon suspension treated by a fine filter, so that the yield and project benefits of the products are greatly improved, and the waste of resources is avoided. A second object of the invention is to provide an apparatus compatible with said process.

The invention is realized by the following technical scheme:

a treatment process of hazardous waste activated carbon comprises the step of decoloring and filtering the activated carbon by a Fente filter, and further comprises the following steps of:

s1: pumping the activated carbon suspension filtered by the filter into a filtering and drying two-in-one machine, introducing 0.2MPa nitrogen for filter pressing to obtain a filter cake and a filtrate, wherein the suspension contains DMF, and the filter pressing can be safely performed by using nitrogen;

s2: introducing low-pressure steam to dry the filter cake, further removing products and solvents in the waste active carbon filter cake, and controlling the moisture content to be 1-5%;

s3: recovering filtrate which mainly contains stearic acid acyl chloride products and solvent, putting the filtrate into a buffer tank, and pumping the filtrate into a recovery device for recovery to prepare products for sale; and the waste filter cake enters a dangerous waste packaging barrel, is subjected to sealed packaging, and is transported to a dangerous waste warehouse for storage.

The utility model provides an equipment for above-mentioned technology, includes the phent filter in the stearic acid acyl chloride production line, phent filter discharge gate intercommunication liquid storage pot for the active carbon turbid liquid of beating out of keeping in, liquid storage pot area mixing system prevents the active carbon deposit, and the outside sets up the heat preservation, prevents that the material from solidifying winter, influences and carries. The discharge port of the liquid storage tank is communicated with the filtering and drying two-in-one machine, the waste activated carbon turbid liquid is pumped into the filtering and drying two-in-one machine through the peristaltic pump, the air inlet of the filtering and drying two-in-one machine is respectively connected with a nitrogen pipeline and a steam pipeline, the nitrogen pipeline is used for providing nitrogen for filter pressing, the steam pipeline is used for providing steam for drying, the solid discharge port of the filtering and drying two-in-one machine is connected with a dangerous waste packaging barrel, a dried filter cake passes through an automatic blanking device and enters the dangerous waste packaging barrel for sealed packaging, the filter cake is transported to a dangerous waste warehouse for storage, the liquid discharge port of the filtering and drying two-in-one machine is communicated with a cache tank, and the filter. After the treatment, the recovery rate of the stearic acid acyl chloride can be effectively improved, and meanwhile, the air pollution caused by volatilization of toxic gas can be prevented due to the sealing property of the equipment.

The invention has the advantages that: (1) through the process and the equipment, more than 95% of the products in the waste activated carbon can be recovered, the yield and project income of the products are greatly improved, and the initial accounting can increase the yield by more than 800 ten thousand every year; (2) by the process and the equipment, the amount of hazardous waste is reduced by 50%, and the disposal cost of the hazardous waste can be saved by more than 200 ten thousand every year; (3) because the hazardous waste is reduced, the hazardous waste packaging materials and storage places are obviously reduced, and the waste of resources is avoided; (4) the investment and the operation cost of waste gas treatment of the hazardous waste storage place are greatly reduced; (5) the equipment is sealed to avoid toxic gas escaping.

Drawings

FIG. 1 is a flow diagram of the process equipment of the present invention.

In the figure, 1, a filter, 2, a liquid storage tank, 3, a peristaltic pump, 4, a nitrogen pipeline, 5, a steam pipeline, 6, a filtering and drying two-in-one machine, 7, a dangerous waste packaging barrel, 8, a buffer tank, 9, a recovery pipeline, 10, an automatic blanking device, 11 and a waste gas pipeline.

Detailed Description

The invention is further illustrated below with reference to the figures and examples.

As shown in the figure, the feed inlet of liquid storage pot 2 is connected to the discharge gate of fine filter 1, and the active carbon turbid liquid after the filtration is squeezed into liquid storage pot 2 through the material pipe and is kept in, in order to prevent the active carbon deposit, need set up agitating unit in the liquid storage pot 2, and the liquid storage pot 2 outside need keep warm and set up, prevents that the material from solidifying winter, influences the transport. The discharge port of the liquid storage tank 2 is connected to the feed port of the filtering and drying two-in-one machine through a pipeline, a peristaltic pump 3 is installed on the pipeline, and the active carbon turbid liquid in the liquid storage tank is pumped into the filtering and drying two-in-one machine 6 through the peristaltic pump 3 for treatment. The filter-dryer 6 may be a SHY-1600 two-in-one filter manufactured by Shanghai five-in-one Industrial filtration Equipment Co.

Two air inlets of the filtering and drying two-in-one machine 6 are respectively connected with a nitrogen pipeline 4 and a steam pipeline 5, when the liquid level of the activated carbon suspension in the filtering and drying two-in-one machine 6 reaches a specified height, the nitrogen pipeline 4 is opened, 0.2Mpa of nitrogen is introduced for filter pressing, the steam pipeline 5 is opened after filter pressing, low-pressure steam is introduced for drying, and products and solvents in waste activated carbon filter cakes are further removed, so that the moisture content is 1-5%. The useless packing bucket of danger 7 is connected to the solid discharge gate of filter drying two-in-one machine 6, and the useless active carbon filter cake of danger after the drying lets in the useless packing bucket of danger, carries out abandonment processing, and automatic unloader 10 is still equipped with usually to the solid discharge gate, carries out the unloading automatically. The liquid outlet of the filtering and drying two-in-one machine 6 is communicated to the feed inlet of the buffer tank 8, the treated filtrate is pumped into the buffer tank 8 for storage, the discharge port of the buffer tank 8 can be connected to a recovery device through a recovery pipeline 9, and the stearic acid acyl chloride is recovered from the filtrate by the recovery device and sold as a product. The exhaust port of the buffer tank 8 is connected with a tail gas pipeline 11, and the tail gas pipeline is communicated to a tail gas treatment device to treat and discharge the waste gas of the filtrate. The whole process of the invention can avoid the escape of toxic gas by sealing the pipeline.

Claims

1. The treatment process of the dangerous waste activated carbon comprises the step of decoloring and filtering the activated carbon by using a filter, and is characterized by further comprising the following steps of:

s1: pumping the activated carbon suspension filtered by the filter into a filter drier, and introducing 0.2MPa nitrogen for filter pressing to obtain a filter cake and a filtrate;

s2: introducing low-pressure steam to dry the filter cake, and controlling the moisture content to be 1-5%;

s3: recovering the filtrate for post-treatment, and discarding the filter cake.

2. The equipment for the treatment process of the dangerous waste activated carbon as claimed in claim 1 is characterized by comprising a Fente filter, wherein a discharge port of the Fente filter is communicated with a liquid storage tank, a discharge port of the liquid storage tank is communicated with a filter drier, an air inlet of the filter drier is respectively connected with a nitrogen pipeline and a steam pipeline, a solid discharge port of the filter drier is connected with a dangerous waste packaging barrel, and a liquid discharge port of the filter drier is communicated with a cache tank.

3. A device for processing hazardous waste activated carbon as claimed in claim 2, wherein a stirring means is provided in the liquid storage tank.

4. A treatment equipment for hazardous waste activated carbon as claimed in claim 2, wherein the liquid storage tank is externally provided with a thermal insulation device.