Filtering and drying device for solid slag in dimethyl carbonate process

Abstract

The utility model discloses a filtering and drying device for solid slag in a dimethyl carbonate process. Comprising a hydrolysis carbonization kettle (R1), a carbonization circulation transfer pump A / B (P1A / P1B), a solid residue three-in-one filter (S1), a gas phase evaporation condenser (E1), a condensate receiving tank (V1), a washing liquid intermediate tank (V2), a washing liquid circulation delivery pump (P2), a filtrate intermediate tank (V3), a filtrate transfer pump (P3), a three-in-one filter vacuum buffer tank (V4) and a three-in-one filter vacuum pump (VP1). The filtering and drying device disclosed by the utility model is operated in a closed state, no gas is emptied, solid slag can be quickly and efficiently filtered and dried, and meanwhile, the moisture content of the solid slag can be ensured to be very low and reach the standard.

Description

TECHNICAL FIELD

[0001] The utility model relates to the production technical field of dimethyl carbonate especially relates to a filter device for dimethyl carbonate catalyst treatment after solid slag. BACKGROUND

[0002] Dimethyl carbonate is also named methyl carbonate, ethane carbonate, and is abbreviated as DMC, dimethyl carbonate is a kind of non-toxic, environmental protection performance excellent, widely used chemical raw material, it is a kind of important organic synthesis intermediate, contains carbonyl, methyl and methoxyl group and other functional groups in molecular structure, has multiple reaction performance, has the characteristics such as using safety, convenient, less pollution, easy transportation in production.DMC not only has little toxicity, also has the characteristics such as high flash point, low vapor pressure and high lower explosive limit in air, therefore is the green solvent of set clean and safety in one, is a kind of " green " chemical product with development prospect.At present, domestic production dimethyl carbonate mainly is the production process using ester exchange method, this method usually carries out ester exchange reaction with propylene carbonate and methanol, generates corresponding dimethyl carbonate and propylene glycol.Ester exchange method has the advantages such as mild reaction condition, raw material easy to obtain, less by-product, but due to this method is to utilize the different azeotrope composition of DMC and methanol under different pressure, separates DMC and methanol by rectification, methanol is recycled in it, so energy consumption is high. SUMMARY

[0003] The utility model solves technical problem in providing a kind of filter drying device for dimethyl carbonate process solid slag, the filter drying device provided in the present application can effectively filter and dry dimethyl carbonate process solid slag.It is provided in the present application that a kind of filter drying device for dimethyl carbonate process solid slag includes: hydrolysis carbonization kettle, carbonization circulating material transfer pump A / B, solid slag three-in-one filter, gas phase evaporation condenser, condensate receiving tank, washing liquid intermediate tank, washing liquid circulating delivery pump, filtrate intermediate tank, filtrate transfer pump, three-in-one filter vacuum buffer tank, three-in-one filter vacuum pump;Wherein the bottom discharge end of the hydrolysis carbonization kettle of dimethyl carbonate catalyst hydrolysis carbonization system is connected with the feed end of the three-in-one filter, the bottom liquid phase discharge end of the three-in-one filter is connected with the feed end of washing liquid intermediate tank, the feed end of filtrate intermediate tank, the bottom solid phase discharge end of the three-in-one filter is connected with ton bag, direct packing, the gas phase discharge end of the three-in-one filter is successively provided with gas phase evaporation condenser, condensate receiving tank, three-in-one filter vacuum buffer tank, three-in-one filter vacuum pump, for condensing receiving gas phase material in dry solid slag process;The discharge end of washing liquid intermediate tank is connected with the feed end of three-in-one filter, is connected with the next section simultaneously, the discharge end of filtrate intermediate tank is connected with the next section.

[0004] The solid-liquid mixture after hydrolysis and carbonization is transferred into the three-in-one filter through the carbonization circulating transfer pump A / B, the material filtered through the three-in-one filter enters into the filtrate intermediate tank, and then is transferred into the next section for use, the solid residue in the three-in-one filter is cleaned by using the washing liquid, all the difficult volatile organic matters in the solid residue are extracted into the washing liquid, and then are treated separately.

[0005] The three-in-one filter has the functions of filtering, washing and drying, the solid residue filtered in the three-in-one filter is further cleaned by using the washing liquid, then the three-in-one filter is vacuumized, the solid residue is further dried by steam under the vacuum state, and the washing liquid is evaporated.

[0006] The utility model has the advantages of the following:

[0007] (1) When the solid-liquid mixture after hydrolysis and carbonization passes through the filter drying device, complete filtration can be realized, and the filtrate almost does not contain solid residue, which is beneficial to the treatment of the filtrate;

[0008] (2) The solid residue is washed by using the device, so that the solid residue almost does not contain high-boiling substances; the washing liquid is recycled, and after saturation, is treated in the next section for recovery, so that the yield of ethylene glycol or 1,2-propylene glycol is improved; (3) The drying process is simple and efficient, and the moisture content of the final solid residue is below 1%;

[0009] (4) The whole process is carried out in a closed condition, no gas is discharged, and the environment is not polluted. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is the device schematic diagram of the utility model. DETAILED DESCRIPTION

[0011] The utility model further describes in connection with the example, the following embodiment is aimed at explaining the utility model, and is not the limitation of the utility model. In view of the existing production dimethyl carbonate uses the hydrolysis carbonization filtration process of catalyst, the utility model provides a kind of filter drying device for solid residue in dimethyl carbonate process, comprising: hydrolysis carbonization kettle R1, carbonization circulating material transfer pump A / B P1A / P1B, solid residue three-in-one filter S1, gas phase evaporation condenser E1, condensate receiving tank V1, washing liquid intermediate tank V2, washing liquid circulating delivery pump P2, filtrate intermediate tank V3, filtrate transfer pump P3, three-in-one filter vacuum buffer tank V4, three-in-one filter vacuum pump VP1;Among dimethyl carbonate production system, the discharge end of two-tower kettle containing catalyst is connected with the feed end of hydrolysis carbonization kettle R1, the discharge end of hydrolysis carbonization kettle R1 is connected with washing liquid intermediate tank V2 feed end, filtrate intermediate tank V3 feed end after pump and three-in-one filter S1 bottom liquid phase discharge end.In practical process, filter residue is about 700kg, is filtered in three-in-one filter with filtration area of 2m2, realizes all filtration, and filtrate is clean.After filtration liquid washing, impurity content is reduced from 5% to below 0.1%, realizes complete washing, reaches the purpose of filtering solid residue and recycling filtrate, washing liquid.

[0012] Three-in-one filter S1 gas phase discharge end is equipped with gas phase evaporation condenser E1, condensate receiving tank V1, three-in-one filter vacuum buffer tank V4, three-in-one filter vacuum pump VP1 in proper order, for condensing receiving dry solid residue process gas phase material.Drying is carried out under 7-10KPaA pressure and 150-160 DEG C, and overall moisture content reaches below 1%, realizes the purpose of dry solid residue, so that solid residue reaches standard, reduces consumption, and increases production capacity.

[0013] The above embodiment is only a kind of implementation form provided by the utility model for filter drying device for solid residue in dimethyl carbonate process, according to other deformation of the scheme provided by the utility model, increase or reduce the component or step in it, or the utility model is applied to the similar technical field with the utility model, all belong to the protection scope of the utility model.

Claims

1. A filter-drying apparatus for dewatering of carbon dioxide removal process sludge, characterized by: The hydrolysis carbonization kettle (R1), carbonization circulating transfer pump A / B (P1A / P1B), solid slag three-in-one filter (S1), gas phase evaporation condenser (E1), condensate receiving tank (V1), washing liquid intermediate tank (V2), washing liquid circulating delivery pump (P2), filtrate intermediate tank (V3), filtrate transfer pump (P3), three-in-one filter vacuum buffer tank (V4), three-in-one filter vacuum pump (VP1) are included; wherein the bottom discharge end of the hydrolysis carbonization kettle (R1) of the dimethyl carbonate catalyst hydrolysis carbonization system is connected to the feeding end of the three-in-one filter (S1) through a pump, the bottom liquid phase discharge end of the three-in-one filter (S1) is connected to the feeding end of the washing liquid intermediate tank (V2) and the feeding end of the filtrate intermediate tank (V3), the bottom solid phase discharge end of the three-in-one filter (S1) is connected to a ton bag, and direct packaging is performed, and the gas phase discharge end of the three-in-one filter (S1) is sequentially provided with the gas phase evaporation condenser (E1), the condensate receiving tank (V1), the three-in-one filter vacuum buffer tank (V4), and the three-in-one filter vacuum pump (VP1) for condensing and receiving the gas phase material in the dry solid slag process; the discharge end of the washing liquid intermediate tank (V2) is connected to the feeding end of the three-in-one filter, and is also connected to the next process section, and the discharge end of the filtrate intermediate tank (V3) is connected to the next process section.

2. A filter-drier device for dewatering of carbon dioxide absorbing material according to claim 1, characterized in that: The bottom liquid phase discharge end of the three-in-one filter (S1) is connected to the feeding end of the washing liquid intermediate tank (V2), and the feeding end of the washing liquid intermediate tank (V2) is connected to the feeding end of the three-in-one filter (S1).

3. A filter-drier device for dewatering and drying the slag in a dimethyl carbonate process according to claim 1, characterized in that: The three-in-one filter (S1) has the functions of filtering, washing, and drying, and the gas phase discharge end of the three-in-one filter (S1) is sequentially provided with the gas phase evaporation condenser (E1), the condensate receiving tank (V1), the three-in-one filter vacuum buffer tank (V4), and the three-in-one filter vacuum pump (VP1).

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