Reaction equipment for improving yield of crude methyl ester

Abstract

The utility model discloses reaction equipment with high crude methyl ester yield, which comprises a stirring kettle and a material circulating system, the material circulating system comprises a circulating pump, a spray pipe arranged in the stirring kettle and a mixing nozzle arranged on the spray pipe, and a bottom outlet of the stirring kettle is connected with a feed port of the circulating pump through a first pipeline. An outlet of the circulating pump is connected with the spray pipe through a second pipeline; the mixing nozzle comprises a first sprayer and a second sprayer, and an outer flaring in the lower portion of the second sprayer is in clearance fit with the conical head through a connecting piece. The material circulating system can realize bottom-out and top-in of materials, so that the mixing of an oil phase and an enzyme water phase is promoted through the reciprocating circulation. In addition, the material circulating system is provided with a plurality of mixing nozzles, the flow speed of spraying of the first spray head is large, so that a negative pressure suction gap is formed at the joint of the second spray head and the first spray head, materials in the stirring kettle can enter the mixing nozzles under the action of negative pressure, an oil phase and an enzyme water phase are intensively mixed, and the yield of fatty acid methyl ester is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of biodiesel preparation, especially to a reaction equipment for improving the yield of crude methyl ester. BACKGROUND

[0002] Biodiesel is a kind of renewable green clean energy that can replace petrochemical diesel oil, and is also an important bio-chemical basic raw material, which has the potential for large-scale industrialization, such as being used as marine fuel oil in combination with petrochemical diesel oil. At present, biodiesel is mostly prepared by using high-acid-value recycled oil as raw oil and lipase as catalyst to make free fatty acids and triglycerides in the raw oil react with methanol to obtain crude methyl ester. The existing production process mostly adopts a continuous production system, such as the fatty acid continuous methyl esterification production system (CN 218609398U) proposed by the applicant early, which discloses that a plurality of continuous settling tanks (with height difference) are used to realize continuous methyl esterification. However, the settling tank is a conventional stirred tank with large volume and high liquid level, which makes the mixing effect of the enzyme aqueous phase (containing methanol) and the raw oil relatively poor, affecting the reaction rate and the yield of crude methyl ester. SUMMARY

[0003] Therefore, the utility model provides a reaction equipment for improving the yield of crude methyl ester, which greatly improves the yield of crude methyl ester by improving the mixing effect of the enzyme aqueous phase and the raw oil.

[0004] To achieve the above-mentioned purpose, the utility model takes the following technical scheme:

[0005] The reaction equipment for improving the yield of crude methyl ester comprises a stirred tank with a feed inlet at the lower part and a discharge outlet at the upper part, and a material circulation system for promoting material mixing, wherein the material circulation system comprises a circulating pump arranged on one side of the stirred tank, a spray pipe arranged in the stirred tank, and a plurality of mixing nozzles arranged at intervals on the spray pipe, the bottom outlet of the stirred tank is connected to the feed inlet of the circulating pump through a first pipeline, and the outlet of the circulating pump is connected to the spray pipe through a second pipeline.

[0006] The mixing nozzle comprises a first spray head arranged on the spray pipe and a second spray head fixed to the first spray head, the head of the first spray head is a conical head with diameters decreasing from bottom to top, and the outer flared mouth of the lower part of the second spray head is connected to the conical head through a connecting piece to form a negative pressure suction gap.

[0007] The beneficial effect is that the material circulating system can realize the bottom-out and up-feeding of the material, and the oil phase and the enzyme water phase are mixed through such reciprocating circulation.

[0008] Preferably, the spray pipe is at least two, and the inclined directions of the mixing nozzles on the at least two spray pipes are opposite; the second pipeline has a main pipe and a branch pipe communicated with each spray pipe, and the main pipe is connected with the feeding port of the circulating pump.

[0009] Preferably, the spray pipe is circularly arranged, and the plurality of mixing nozzles on each spray pipe are arranged along the circumferential direction, and the circular spray pipe can promote the uniform mixing of the oil phase and the enzyme water phase in the reaction kettle.

[0010] Compared with the prior art, the material circulating system of the utility model can realize the bottom-out and up-feeding of the material, and the oil phase and the enzyme water phase are mixed through such reciprocating circulation. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structural schematic view of the utility model.

[0012] Figure 2 is a schematic view of the mixing nozzle.

[0013] Figure 3 is Figure 2 the top view. DETAILED DESCRIPTION

[0014] The embodiments of the utility model will be described in detail below with reference to the drawings, and the embodiments are implemented on the premise of the technical scheme of the utility model, and the detailed implementation mode and specific operation process are given, but the protection scope of the utility model is not limited to the following embodiments.

[0015] It should be noted that in the description of the utility model, the relationship terms such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between the entities or operations.

[0016] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected" that can appear should be understood broadly, for example, it can be fixedly connected, or integrally connected, or mechanically connected, or electrically connected, or directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0017] As Figures 1-3 The utility model discloses a reaction equipment of improving crude methyl ester yield, including the agitator tank 1 with the feed inlet in the lower part and the discharge port in the upper part, still include the material circulation system of improving material mixing intensity, the stirring shaft 2 of agitator tank 1 has multiple groups of stirring vane 3 from top to bottom, ensure stirring intensity;

[0018] Material circulation system includes the circulation pump 4 being arranged at one side of agitator tank 1, the spray pipe 5 being arranged in agitator tank 1 and multiple mixing nozzles being spaced apart on spray pipe 5, the bottom outlet is formed in the bottom of agitator tank 1, and the bottom outlet is connected with the inlet of circulation pump 4 by first pipeline 7;The flange interface of spray pipe 5 is located at the outside of agitator tank 1, and the outlet of circulation pump 4 is connected with the flange interface of spray pipe 5 by second pipeline 8, circulation pump 4 provides circulating injection power for material, and circulation pump 4 extracts the mixed material in agitator tank 1, so that the extracted mixed material enters spray pipe 5 through second pipeline 8, and then is sprayed by mixing nozzle, the high-speed material sprayed by mixing nozzle forms turbulent flow in agitator tank, realizes the high-efficiency and intense mixing of raw oil and enzyme water phase, improves mixing effect, improves the reaction conversion rate of raw oil and methanol, further improves the yield of crude methyl ester, and improves economic benefit.

[0019] In combination Figures 2-3It can be seen that the mixing nozzle comprises a first nozzle 5a arranged on the spray pipe 5 and a second nozzle 5b fixed on the first nozzle 5a, the head of the first nozzle 5a is a conical head 5e with diameters decreasing from bottom to top, and the outer flared mouth of the lower part of the second nozzle 5b is in gap cooperation with the conical head 5e through a connecting piece (i.e. connecting rod 5c) to form a negative pressure suction gap 5d. In operation, the mixture in the spray pipe 5 is sprayed out by the first nozzle 5a, and due to the high jet velocity, a certain negative pressure is generated between the outer flared mouth and the conical head 5e, so that the material in the stirred tank 1 enters the second nozzle 5b under the action of the negative pressure, and the material sprayed out by the first nozzle 5a is mixed together and then sprayed out by the second nozzle 5b, so as to improve the turbulent flow range and further improve the mixing effect of the two phases.

[0020] In actual installation, two spray pipes 5 (of course, three or four or the like) are installed in the stirred tank 1 in an up-down interval, the spray pipes 5 and the multiple groups of stirring blades 3 are arranged in an up-down interval, so as to ensure the normal operation of each group of stirring blades 3 and the normal spraying of each spray pipe 5. The spray pipe 5 is preferably in a circular ring structure, the mixing nozzle on the lower spray pipe 5 is inclined upward, the mixing nozzle on the upper spray pipe 5 is inclined downward, and the mixing nozzles on the upper and lower spray pipes 5 are both directed to the center of the stirred tank 1, so that the mixing nozzle on the lower spray pipe 5 is inclined upward for spraying and the mixing nozzle on the upper spray pipe 5 is inclined downward for spraying, so as to make the material mixing more uniform and improve the product yield.

[0021] In actual installation, the first valve F1 is arranged on the first pipeline 7, the second valve F2 is arranged on the main pipe of the second pipeline 8, the second pipeline 8 has branch pipes connected with the spray pipes 5 one by one, and the third valve F3 is arranged on each branch pipe. Details are shown in Figure 1 In production, the first valve F1, the second valve F2 and the third valve F3 are all in an open state; and in case of failure or shutdown, the first valve F1, the second valve F2 and the third valve F3 are closed.

[0022] In actual operation, the mixed raw oil and enzyme water phase (containing methanol) enter the stirred tank 1 through the feed inlet at the lower part of the stirred tank 1, and the material is stirred by the stirring blades 3; the circulating pump 4 is started, the material in the stirred tank 1 is pumped out by the circulating pump 4 and then pumped into the spray pipe 5 in the stirred tank 1, and then enters the stirred tank 1 again through the mixing nozzle on the spray pipe 5, so as to realize the strong mixing of the raw oil and the enzyme water phase, improve the uniformity of the mixing, and improve the mixing effect, thereby improving the yield of crude methyl ester. Through tests, when the continuous methyl esterification production is carried out by replacing the traditional reaction kettle with the utility model, the content of the crude methyl ester can be increased to more than 90%, and the yield of the crude methyl ester is greatly improved.

[0023] Finally, it should be further emphasized that the above is only the preferred embodiment of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still be modified without the need for creative labor to the technical solutions recorded in the foregoing embodiments, or to make equivalent replacement for some of the technical features. Thus, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A reaction apparatus for improving the yield of crude methyl ester, comprising a stirred tank having a feed inlet at the lower portion and a discharge outlet at the upper portion, characterized in that: The material circulation system for promoting the mixing of materials comprises a circulation pump arranged on one side of the stirring kettle, a spray pipe arranged in the stirring kettle, and a plurality of mixing nozzles arranged at intervals on the spray pipe, wherein the bottom outlet of the stirring kettle is connected to the feed inlet of the circulation pump through a first pipeline, and the outlet of the circulation pump is connected to the spray pipe through a second pipeline; The mixing nozzle comprises a first spray head arranged on the spray pipe and a second spray head fixed to the first spray head, the head of the first spray head is a conical head with diameters decreasing from bottom to top, and the outer flared mouth of the lower part of the second spray head is connected to the conical head through a connecting piece to form a negative pressure suction gap.

2. The reaction apparatus for improving the yield of crude methyl ester according to claim 1, characterized by: The spray pipe is at least two, and the inclined directions of the mixing nozzles on the at least two spray pipes are opposite; the second pipeline has a main pipe and a branch pipe communicating with each spray pipe, and the main pipe is connected to the feed inlet of the circulation pump.

3. The reaction apparatus for improving the yield of crude methyl ester according to claim 1, characterized by: The spray pipe is arranged in a circular ring shape, and the plurality of mixing nozzles on each spray pipe are arranged at intervals along the circumference thereof.

Images