Preliminary distillation, cooling and phase separation device for furfural production
By adopting a combined design of floating valve trays, condensers, and vertical tube condensers in furfural production equipment, along with perforated trays, the problems of high energy consumption and clogging were solved, and temperature control and phase separation rate were improved.
Patent Information
- Application Number
- CN202520464464.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-17
AI Technical Summary
Existing furfural production equipment has high energy consumption and is prone to clogging in the phase separation step. Traditional condensers have poor control over the return water temperature, which affects production efficiency.
The design employs a combination of a floating valve tray at the top of the primary distillation column, a first condenser, a phase separator, and a vertical tube condenser. Combined with two layers of perforated trays and reflux lines, the reflux liquid temperature is controlled to prevent blockage and improve the phase separation rate.
Without increasing energy consumption, precise control of the reflux liquid temperature was achieved, the phase separation rate was improved, the risk of condenser blockage was reduced, and production efficiency was increased.
Smart Images
Figure CN223906774U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to furfural production technical field, specifically speaking, relate to a kind of primary distillation, cooling, phase separation device for furfural production. BACKGROUND
[0002] Furfural is an important organic chemical raw material, when producing, it needs to hydrolyze raw material first, then evaporates and condenses hydrolysis solution into about 7%-10% content furfural aqueous solution;Subsequently, it enters into primary distillation column high-temperature distillation, and is concentrated into about 35% content furfural steam, then after two-stage cooling, concentrated furfural solution is obtained;Finally, concentrated furfural solution needs to be phase-separated, so that furfural product is separated from water.
[0003] In the phase separation step, to ensure separation effect, concentrated furfural solution needs to be cooled to very low temperature, and separated water can be reflowed to the top of primary distillation column to control column top temperature and material balance.In this step, the temperature of reflow water has significant influence on production, traditional primary distillation column top is provided with one-stage condenser and two-stage cooler two-step cooling, and the temperature of separated water is very low, which greatly increases the energy consumption of primary distillation column;And if water temperature is too high, it will greatly reduce the subsequent phase separation speed, and existing equipment has poor temperature control ability for reflow water.In addition, the uppermost layer of traditional primary distillation column uses float valve tray, and the filtering effect of float valve tray on small water droplets and small dust in steam is poor, which is easy to block condenser.
[0004] In order to solve the above problems, people have been seeking an ideal technical solution. SUMMARY
[0005] The utility model aims at the deficiency of prior art, and provides a kind of primary distillation, cooling, phase separation device for furfural production with scientific design, reflow water temperature control is better, production efficiency is high, and condenser is not easy to block.
[0006] In order to achieve the above object, the technical scheme that the utility model adopts is as follows: a kind of primary distillation, cooling, phase separation device for furfural production, including primary distillation column, first condenser, phase separator and vertical tube bundle condenser, the top of the primary distillation column is provided with float valve tray, the steam outlet of the top of the primary distillation column is communicated with the steam inlet of the first condenser by pipeline, the condensate outlet of the first condenser is directly communicated with the liquid inlet of the phase separator by pipeline, the bottom outlet of the phase separator is directly connected with the tube side inlet end of the vertical tube bundle condenser, and the upper portion of the phase separator is communicated with the reflow liquid inlet of the top of the primary distillation column by reflow pipe.
[0007] Beneficial effects: the furfural concentrate liquid cooled once by the first condenser directly enters the phase separator, part of the upper liquid flows back to the top of the primary distillation tower through the reflux pipe, at this time, the temperature of the reflux liquid is neither too low nor too high, thereby ensuring the subsequent phase separation speed without greatly increasing the energy consumption; the bottom outlet of the phase separator is directly connected with the tube side inlet end of the vertical tube condenser, and the lower liquid can be rapidly cooled in the vertical tube condenser, thereby further accelerating the phase separation speed.
[0008] Based on the above, the phase separator comprises a column body and a conical part connected below the column body, and a manhole is arranged on the side of the conical part.
[0009] Beneficial effects: the manhole is convenient for maintenance.
[0010] Based on the above, a liquid level meter and a temperature table are installed on the column body.
[0011] Beneficial effects: the liquid level meter and the temperature table are convenient for monitoring the liquid level and the temperature in the phase separator.
[0012] Based on the above, two layers of sieve trays are further arranged above the float valve tray in the primary distillation tower, and the reflux liquid inlet is arranged between the float valve tray and the sieve tray.
[0013] Beneficial effects: the two layers of sieve trays can filter the powder solid materials entrained in the furfural steam, thereby preventing the first condenser from being blocked.
[0014] Based on the above, the sieve tray comprises a support frame and a plurality of splicing plates, the plurality of splicing plates are spliced into filter plate surfaces and are installed on the support frame through bolts.
[0015] Beneficial effects: the plurality of splicing plates are convenient for dismounting and mounting the sieve tray. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a structure schematic view of the primary distillation, cooling and phase separation device for furfural production in the utility model.
[0017] Figure 2 It is a structure schematic view of the phase separator and the vertical tube condenser in the utility model.
[0018] Figure 3 It is a structure schematic view of the inside of the primary distillation tower top.
[0019] Figure 4 It is a splicing schematic view of the sieve tray in the utility model.
[0020] Figure 5This is another schematic diagram of the splicing of the perforated tray in this utility model.
[0021] In the diagram: 1. Primary distillation column; 2. First condenser; 3. Phase separator; 4. Vertical tube condenser; 5. Valve tray; 6. Piping; 7. Reflux pipe; 8. Level gauge; 9. Thermometer; 10. Sieve tray; 11. Reflux inlet; 12. Connecting plate; 31. Columnar section; 32. Conical section; 33. Manhole. Detailed Implementation
[0022] The technical solution of this utility model will be further described in detail below through specific embodiments.
[0023] like Figures 1-3 As shown, a primary distillation, cooling, and phase separation device for furfural production includes a primary distillation column 1, a first condenser 2, a phase separator 3, and a vertical tube condenser 4. The primary distillation column 1 is equipped with a floating valve tray 5 at the top. The steam outlet at the top of the primary distillation column 1 is connected to the steam inlet of the first condenser 2 via a pipe 6. The condensate outlet of the first condenser 2 is directly connected to the liquid inlet of the phase separator 3 via a pipe. The bottom outlet of the phase separator 3 is directly connected to the tube inlet end of the vertical tube condenser 4. The phase separator 3 and the vertical tube condenser 4 are connected as one unit. The upper part of the phase separator 3 is connected to the reflux inlet 11 at the top of the primary distillation column 1 via a reflux pipe 7.
[0024] The phase separator 3 specifically includes a cylindrical part 31 and a conical part 32 connected below the cylindrical part 31. A manhole 33 is provided on the side of the conical part 32, which facilitates subsequent maintenance. A level gauge 8 and a thermometer 9 are installed on the cylindrical part 31 for monitoring the liquid level and temperature.
[0025] Working principle:
[0026] The furfural vapor in the primary distillation column 1 enters the first condenser 2 through pipe 6. After one cooling, the furfural concentrate directly enters the phase separator 3. Part of the upper liquid flows back to the top of the primary distillation column 1 through the reflux pipe 7. At this time, the temperature of the reflux liquid is neither too low nor too high, thus ensuring the subsequent phase separation rate without significantly increasing energy consumption. The bottom outlet of the phase separator 3 is directly connected to the tube inlet of the vertical tube condenser 4, and the lower liquid can be rapidly cooled in the vertical tube condenser 4, greatly accelerating the phase separation rate and thus significantly improving the system energy efficiency.
[0027] In order to avoid the dust entrained in the furfural steam from blocking the first condenser 2, two layers of sieve trays 10 are arranged above the float valve tray 5 in the preliminary distillation tower 1, the reflux liquid inlet 11 is arranged between the float valve tray 5 and the sieve tray 10, and the total area of the sieve holes of the sieve tray 10 should be greater than 4 times the area of the pipeline 6, so that the two layers of sieve trays 10 can effectively filter the powder solid materials entrained in the furfural steam.
[0028] In order to facilitate the installation of the sieve tray 10, the sieve tray 10 comprises a support frame (arranged below the filter plate surface) and a plurality of splicing plates 12, the plurality of splicing plates 12 are spliced into a filter plate surface (the splicing form can adopt Figure 4 or Figure 5 ), and are installed on the support frame through bolts.
[0029] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solutions of the present application, all of them should be covered in the technical solution range of the present application claimed.
Claims
1. A device for initial distillation, cooling and phase separation for furfural production, comprising an initial distillation column, a float valve tray is arranged at the top of the initial distillation column, characterized in that: It also comprises a first condenser, a phase separator and a vertical shell-and-tube condenser, the steam outlet at the top of the primary distillation column is connected to the steam inlet of the first condenser through a pipeline, the condensate outlet of the first condenser is directly connected to the liquid inlet of the phase separator through a pipeline, the bottom outlet of the phase separator is directly connected to the tube-side inlet end of the vertical shell-and-tube condenser, and the upper part of the phase separator is connected to the reflux liquid inlet at the top of the primary distillation column through a reflux pipeline.
2. The initial distillation, cooling, and phase separation device for furfural production according to claim 1, characterized in that: The phase separator comprises a cylindrical part and a conical part connected below the cylindrical part, and a manhole is arranged on the side of the conical part.
3. The initial distillation, cooling, and phase separation device for furfural production according to claim 2, characterized in that: A liquid level gauge and a thermometer are mounted on the cylindrical part.
4. The apparatus for initial distillation, cooling and phase separation in furfural production according to any one of claims 1-3, characterized in that: Two layers of sieve trays are arranged above the float valve tray in the primary distillation column, and the reflux liquid inlet is arranged between the float valve tray and the sieve tray.
5. The initial distillation, cooling, and phase separation device for furfural production according to claim 4, characterized in that: The sieve tray comprises a support frame and a plurality of spliced plates, the plurality of spliced plates are spliced into filter plate surfaces and are mounted on the support frame through bolts.