CN202912930U

CN202912930U - Strengthened mixing reaction device for continuously preparing biodiesel

Info

Publication number: CN202912930U
Application number: CN2012205220521U
Authority: CN
Inventors: 王存文; 冀少卿; 王为国; 覃远航; 吕仁亮; 张俊峰
Original assignee: Wuhan Institute of Technology
Current assignee: Wuhan Institute of Technology
Priority date: 2012-10-12
Filing date: 2012-10-12
Publication date: 2013-05-01
Anticipated expiration: 2022-10-12

Abstract

The utility model relates to a strengthened mixing reaction device for continuously preparing biodiesel. The strengthened mixing reaction device comprises a tubular reactor and a premixer, and is characterized in that a guide flow cylinder is mounted at the inlet end of the tubular reactor. The strengthened mixing reaction device has the advantages that under the guide of the guide flow cylinder with an appropriate size, material is subjected to back mixing at the inlet end of the reactor through the order cycle; the beneficial effects caused by the increase of the mutual solubility between a supercritical methanol phase and an oil phase are higher than the adverse effect caused by back mixing, the oil-methanol ratio is reduced, and the reaction time is shortened. The reduction of the oil-methanol ratio and the shortening of the reaction time avoid the coking of the biodiesel at a high temperature, so that the energy consumption is reduced, and the oil yield is improved. The arrangement of the guide flow cylinder strengthens the reaction process, improves the production efficiency of the reactor, and further achieves the continuous production, low energy consumption and high yield of biodiesel.

Description

Serialization prepares the enhancing mixed reaction unit of biofuel

Technical field

The utility model relates to the manufacturing and processing equipment of biofuel, and particularly a kind of is the enhancing mixed reaction unit that the raw material serialization prepares biofuel with acidification oil, sewer oil, waste cooking oil, vegetables oil.

Background technology

Biofuel is the renewable energy source of cleaning, greatly develops biofuel to sustainable economic development, advances energy substitution, alleviates environmental stress, and the control urban atmospheric pollution has important strategic importance.

In the suitability for industrialized production, adopt ester exchange process to prepare biofuel at present more.This method is utilized the alcohols materials such as methyl alcohol, and the glycerine in the tri-glyceride is replaced to get off, and forms the fatty acid methyl ester of long-chain.Because the immiscible system of oleyl alcohol is mixed difficulty in the popular response device, so long reaction time, low conversion rate, energy consumption are large.

For addressing the above problem, the reaction unit of a lot of efficient preparation biofuel appears in the recent period.Chinese patent CN 101717698A propose to add solubility promoter and promotes the oleyl alcohol two-phase to mix, and reaction is carried out in homogeneous phase, will make troubles and increases raw materials cost to subsequent disposal but introduce solubility promoter.The Chinese patent CN 201241095Y Hydrodynamic cavitation device of in traditional reactor, connecting, producing cavitation bubble and cavitation bubble grows up and violent collapse, be conducive to that reaction solution fully mixes, emulsification, reaction interface is enlarged rapidly, be conducive to quick biodiesel synthesis, but series connection Hydrodynamic cavitation device need to pass through force (forcing) pump, has increased the complicacy of reaction unit.Chinese patent CN 1919973A proposes to utilize the loop turbulent flow reactor to form the device that a cover continous way prepares biofuel, raw material enters from loop turbulent flow reactor bottom, in the loop turbulent flow reactor, react, the mixture of process reaction is from the reactor head discharging, part material is got back to the circulation mixing pump, again enter the loop turbulent flow reactor, another part enters second reactor, the circulation that has realized raw material mixes, but circulation loop need to be set, working condition is complicated, and the reaction mass outer circulation need to be passed through outer power, and energy consumption is increased.

Therefore, need a kind of simple in structure, handling ease of exploitation, efficient is high, energy consumption is low and biodiesel production apparatus that can the serialization volume production.

Summary of the invention

Technical problem to be solved in the utility model be a kind of simple in structure, handling ease is provided for above-mentioned prior art, efficient is high, energy consumption is low and enhancing mixed reaction unit that can the continuous production biofuel.

The novel technical scheme that adopts that solves the problems of the technologies described above of this experiment is: a kind of serialization prepares the enhancing mixed reaction unit of biofuel, comprises tubular reactor and premixer, it is characterized in that: at the tubular reactor entrance end guide shell is housed.

Press such scheme, premixer belongs to passive mixing, adopts the reducer tee web member.

Press such scheme, the length-to-diameter ratio of guide shell is 1:1～12:1.

Press such scheme, guide shell is 0.3～0.8 with the ratio of the caliber of tubular reactor.

Press such scheme, the distance of the bottom of guide shell and tubular reactor bottom is 0.5～5 times of caliber of tubular reactor.

Principle of work: methyl alcohol and stock oil enter tubular reactor after mixing by premixer, at the tubular reactor entrance end guide shell is set, in the reaction process, material is the mixture of supercritical methanol phase and oil phase in the guide shell, and material is the oil phase of incomplete reaction in the density less, annular space, density is relatively large, under the guiding of guide shell, material circulates in order around the water conservancy diversion barrel, realizes that the oil phase of incomplete reaction mixes at the Reactor inlet end with fresh feed.Contain intermediate product in the oil phase of incomplete reaction, the cosolvent that this intermediate product dissolves each other for increasing two-phase, the content that makes methyl alcohol in the oil phase and supercritical methanol mutually in oily content increase simultaneously, known by the law of mass action, the increase of two-phase mutual solubility increases speed of reaction, has strengthened reaction process.

The beneficial effects of the utility model are: adopt premixer that the oleyl alcohol immiscible fluid is carried out premix, effectively promoted the two-phase mixing.By the guide shell of suitable size is set, make material pressure difference by self system in reactor realize in order circulation, the mutual solubility that increases Reactor inlet end supercritical methanol phase and oil phase makes the speed of reaction increase.Under the guiding of suitable size guide shell, the orderly circulation of material makes material produce back-mixing at the Reactor inlet end, the disadvantageous effect that the beneficial effect that supercritical methanol phase and the increase of oil phase mutual solubility produce brings greater than back-mixing, and alcohol oil rate reduces, and the reaction times shortens.The coking of biofuel under the high temperature has been avoided in the reduction of alcohol oil rate and the shortening in reaction times, thereby makes Energy Intensity Reduction, and the grease yield improves.Reaction process has been strengthened in arranging of guide shell, has increased the production efficiency of reactor, and then has realized serialization, less energy-consumption, the high yield of production of biodiesel.

Description of drawings

Fig. 1 is the structural representation of enhancing mixed reaction unit;

Fig. 2 is application art schema of the present utility model.

Embodiment

The enhancing mixed reaction unit of the utility model continuous production biofuel comprises tubular reactor 1, guide shell 2 and premixer 3.Guide shell 2 is installed in the entrance end of tubular reactor 1, and the length-to-diameter ratio of guide shell is 1:1～12:1, is convenient to the mixing in reaction initial stage intermediate product and fresh material, increases the mutual solubility of Reactor inlet end supercritical methanol phase and oil phase.Premixer 3 screwed connections are in the bottom of tubular reactor 1, premixer belongs to passive mixing, adopt the reducer tee web member, guide shell is 0.3～0.8 with the ratio of the caliber of tubular reactor, and the distance of the bottom of guide shell and tubular reactor bottom is 0.5～5 times of caliber of tubular reactor.Methyl alcohol and stock oil enter tubular reactor 1 after mixing by premixer 3, under the guiding of the guide shell 2 of suitable size, mixture rises in guide shell (ascent stage), a part rises to the upper end continuation reaction of tubular reactor when arriving the guide shell top, a part (containing the intermediate product as cosolvent) enters in the reactor annular space (downcomer) and descends, arrive reactor bottom and mix with fresh material, thereby mixture enters the orderly circulation that guide shell is realized material again under the driving of density difference inside and outside the guide shell.

The utility model is applied to actual process, and Fig. 2 has used the technical process that the utility model prepares biofuel.Stock oil (soybean oil) by stock oil volume pump 6 incoming stock oily preheat coils 8, is preheating to 350 ℃ by stock oil test tank 4; Equally, methyl alcohol enters methyl alcohol preheat coil 9 by methyl alcohol test tank 5 by methyl alcohol volume pump 7, methyl alcohol preheating gasification, methanol steam and hot charge oil enter enhancing mixed reaction unit 10 simultaneously with the ratio of mol ratio 30:1, in the enhancing mixed reaction unit, by the orderly circulation of reaction mass and the cosolvent effect of reaction intermediate the oleyl alcohol two-phase is fully mixed, enter reactor coil pipe 11 after the mixing, by back pressure valve 12 conditioned reaction pressure, 350 ℃ of temperature, successive reaction under the pressure 15 MPa conditions, subsequently, reaction product enters flash tank 13, light constituent (methyl alcohol) is by recycling after 14 condensations of methyl alcohol cooling tank, and restructuring minute (coarse biodiesel) is cooled off by product cooling tank 15 and collected.The coarse biodiesel of collecting obtains biofuel through follow-up treating process.

Used the novel process of utility model and do not used enhancing mixed reaction unit technique relatively, the biofuel yield brings up to 92% from 90%.Reach the required molar ratio of methanol to oil of the highest yield and drop to 30:1 from 40:1, methanol usage reduces, and has reduced the treatment capacity of follow-up Methanol Recovery, has effectively saved energy consumption; Required reaction time shortens to 800 s from 1000 s, and speed of response is accelerated, and has strengthened reaction process, has increased the production efficiency of reactor, has realized serialization, less energy-consumption, the high yield of production of biodiesel.

Claims

1. a serialization prepares the enhancing mixed reaction unit of biofuel, comprises tubular reactor (1) and premixer (3), it is characterized in that: at the tubular reactor entrance end guide shell (2) is housed.

2. serialization according to claim 1 prepares the enhancing mixed reaction unit of biofuel, and it is characterized in that: premixer belongs to passive mixing, adopts the reducer tee web member.

3. serialization according to claim 1 and 2 prepares the enhancing mixed reaction unit of biofuel, it is characterized in that: the length-to-diameter ratio of guide shell is 1:1～12:1.

4. serialization according to claim 1 and 2 prepares the enhancing mixed reaction unit of biofuel, it is characterized in that: guide shell is 0.3～0.8 with the ratio of the caliber of tubular reactor.

5. serialization according to claim 1 and 2 prepares the enhancing mixed reaction unit of biofuel, it is characterized in that: the distance of the bottom of guide shell and tubular reactor bottom is 0.5～5 times of caliber of tubular reactor.