Primary dealcoholization system for crude alkyl glycoside

Abstract

The utility model relates to a primary dealcoholization system for crude alkyl glycoside, which mainly solves the problem that the crude alkyl glycoside remains in a material distribution area due to the material distribution mode of the crude alkyl glycoside in the primary dealcoholization system for crude alkyl glycoside, and adopts the technical scheme that the primary dealcoholization system for crude alkyl glycoside comprises a crude alkyl glycoside falling film tube dealcoholization device (100), the upper opening of the dealcoholization pipe is higher than the lower surface of the upper pipe plate and below the upper surface of the upper pipe plate; an in-pipe component (112) is arranged at an upper opening of the dealcoholization pipe and extends into the dealcoholization pipe from the upper opening of the dealcoholization pipe, the side face of the in-pipe component is in the shape of the side face of a rotating body, the diameter of the top of the rotating body is smaller than that of the bottom of the rotating body, and a gap is reserved between the lower edge of the side face of the rotating body and the inner wall of the dealcoholization pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to crude alkyl glycoside primary dealcoholization system. BACKGROUND

[0002] There are two process routes for producing alkyl glycoside, one route is two-step method (also known as acetal exchange method or transglycosylation method), and the other is one-step method (also known as direct method). The one-step method is to make fatty alcohol (usually C8-18 fatty alcohol) react with glucose in the presence of an acid catalyst to obtain alkyl glycoside. Since the reaction is a reversible reaction, in order to fully convert glucose into glycoside, an excess of fatty alcohol is required, so there is a large amount of unreacted fatty alcohol in the product material. After neutralization of the material, these unreacted fatty alcohols need to be removed from the material. The removal of fatty alcohol usually requires a two-stage dealcoholization system, the first-stage dealcoholization system is a falling film dealcoholization system, and the second-stage dealcoholization system is a scraper dealcoholization system. At present, the mainstream device of the first-stage dealcoholization system is a falling film dealcoholization device with tubes. After the crude glycoside containing unreacted fatty alcohol enters the device, the material is distributed to the tubes through overflow, and then the material flows from the inner wall of the tubes in the form of a liquid film from top to bottom. The outside of the tubes is heated by high-temperature heat-conducting oil, and the entire device is in a negative pressure state (-98 to -99 Kpa). By reducing the pressure drop, the boiling point of the fatty alcohol is reduced to evaporate and remove the fatty alcohol from the crude glycoside. However, the dealcoholizer of the existing crude alkyl glycoside first-stage dealcoholization system uses a design in which the crude alkyl glycoside inlet is lower than the upper opening of the dealcoholization tube, thereby distributing the crude alkyl glycoside between the dealcoholization tubes through overflow. However, this distribution method inevitably causes a large amount of crude alkyl glycoside to accumulate on the upper surface of the upper tube plate, which causes difficulties in cleaning during switching between different specifications of products or maintenance of the falling film tube dealcoholization device, and also easily causes significant product loss due to cleaning. SUMMARY

[0003] The utility model solves the problem of crude alkyl glycoside residue in the existing crude alkyl glycoside first-stage dealcoholization system due to the distribution method of crude alkyl glycoside, and provides a new crude alkyl glycoside first-stage dealcoholization system. This system uses a distribution method different from the prior art, which has the advantage of reducing the residue of crude alkyl glycoside in the distribution area.

[0004] To solve the above technical problems, the technical scheme is as follows:

[0005] The crude alkyl glycoside primary dealcoholization system comprises a crude alkyl glycoside falling film column dealcoholization device (100), which comprises a container, an upper tube sheet (102) and a lower tube sheet (107) arranged in the container, and three regions separated by the upper tube sheet and the lower tube sheet, namely a crude alkyl glycoside distribution region, a dealcoholization tube heating region and a gas-liquid separation region (106) in the dealcoholization device, wherein the crude alkyl glycoside distribution region is above the upper tube sheet, the dealcoholization tube heating region is between the upper tube sheet and the lower tube sheet, and the gas-liquid separation region in the dealcoholization device is below the lower tube sheet; the crude alkyl glycoside distribution region is provided with a crude alkyl glycoside inlet (110); the container is provided with a dealcoholization tube (109) having an upper opening and a lower opening, wherein the upper opening of the dealcoholization tube communicates with the crude alkyl glycoside distribution region, and the lower opening of the dealcoholization tube communicates with the gas-liquid separation region in the dealcoholization device; the gas-liquid separation region in the column dealcoholization device is provided with a column dealcoholization device alkyl glycoside material discharge channel (105) and a column dealcoholization device alcohol vapor outlet (104); and the dealcoholization system is provided with a fatty alcohol condenser (200) for condensing alcohol vapor generated by the column dealcoholization device into a liquid.

[0006] The upper opening of the dealcoholization tube is higher than the lower surface of the upper tube sheet and below the upper surface of the upper tube sheet.

[0007] A tube internal component (112) is arranged at the upper opening of the dealcoholization tube, the tube internal component (112) extends into the dealcoholization tube from the upper opening of the dealcoholization tube, the side surface of the tube internal component has the shape of a rotating body side surface, the rotating body has a top diameter smaller than a bottom diameter, and the lower edge of the rotating body side surface leaves a gap with the inner wall of the dealcoholization tube.

[0008] In the above technical solution, the rotating body is preferably a circular cone or a circular truncated cone, and more preferably a circular truncated cone.

[0009] To achieve the purpose of condensing alcohol vapor generated by the column dealcoholization device into a liquid, the column dealcoholization device alcohol vapor outlet (104) can be directly connected to the fatty alcohol condenser (200) inlet, and more preferably, a gas-liquid separator (600) is arranged between the column dealcoholization device alcohol vapor outlet (104) and the fatty alcohol condenser inlet, the column dealcoholization device alcohol vapor outlet (104) is connected to the gas-liquid separator inlet, and the gas-liquid separator gas phase alcohol outlet (601) is connected to the fatty alcohol condenser inlet.

[0010] The gas-liquid separator can be at least one selected from the group consisting of a gas-liquid static separation device, a centrifugal gas-liquid separation device, a cyclone gas-liquid separation device, a filter gas-liquid separation device, a float gas-liquid separation device, an electric dust removal gas-liquid separation device, a packing separation device and a baffle separation device.

[0011] In the above technical solution, the axis of the rotating body is preferably coincident with the axis of the dealcoholization tube.

[0012] In the technical scheme, the included angle between the generatrix of the rotating body and the axis of the dealcoholization pipe is alpha, preferably greater than 0° and less than 90°, such as but not limited to 1°, 2°, 3°, 4°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85° and the like, more preferably 5° to 30°.

[0013] In the technical scheme, preferably, the inner member bottom has a curved surface that is curved upward from the axis of the dealcoholization pipe and upward from the lower edge line of the side surface of the rotating body.

[0014] In the technical scheme, the included angle between the curved surface and the side surface of the rotating body is beta, greater than 0° and less than 90°-alpha.

[0015] In the technical scheme, preferably, the alkyl glycoside material discharge channel (105) of the tube dealcoholization device is provided with an alkyl glycoside discharge pump (500).

[0016] In the technical scheme, preferably, the alkyl glycoside outlet (603) of the gas-liquid separator is input into the alkyl glycoside material discharge channel (105) of the tube dealcoholization device.

[0017] In the technical scheme, preferably, the discharge port (202) of the condenser is input into the feed inlet of the vacuum buffer tank (300).

[0018] In the technical scheme, preferably, the vacuum buffer tank (300) is provided with a vacuum interface (302).

[0019] In the technical scheme, preferably, the vacuum buffer tank (300) is provided with a vacuum buffer tank discharge port (301).

[0020] In the technical scheme, preferably, the vacuum buffer tank discharge port (301) is input into the inlet of the vacuum buffer tank discharge pump (400).

[0021] The main effect of the utility model is: one of the effects of the utility model is that the coarse alkyl glycoside is no longer relied on the overflow distribution of the upper opening of the dealcoholization pipe being higher than the coarse alkyl glycoside inlet, which reduces the residue of the coarse alkyl glycoside above the tube sheet; the second effect of the utility model is that the tube inner member is provided, the inclined side surface of the tube inner member and the gap between the inner wall of the dealcoholization pipe suppress the uneven spreading of the coarse alkyl glycoside in the inner wall of the dealcoholization pipe caused by the flow fluctuation of the coarse alkyl glycoside inlet or the turbulence of the material, and the fatty alcohol removal rate of the coarse alkyl glycoside is improved.

[0022] The further effect of the utility model is that the curved surface can prevent the coarse alkyl glucoside from being introduced to the alcohol removal pipe inner surface; the gas-liquid separator is used to treat the stream flowing out of the alcohol vapor outlet of the column tube alcohol removal device, the alkyl glucoside carried in the alcohol vapor is intercepted, and the loss of the alkyl glucoside is reduced.

[0023] In the utility model specification, the measurement of the residual amount of the alkyl glucoside in the fatty alcohol is carried out by the method in appendix B of GB / T19464-2014, which can measure the polymerization degree and the alkyl glucoside content.

[0024] In the utility model specification, the mass fraction of the fatty alcohol in the coarse alkyl glucoside is measured by the method in appendix A of GB / T19464-2014, the alcohol removal rate of the coarse alkyl glucoside primary alcohol removal system is calculated according to the mass fraction of the fatty alcohol, and the formula is as follows:

[0025] The alcohol removal rate of the coarse alkyl glucoside primary alcohol removal system = ((A-B) / A) * 100%

[0026] In the formula, A is the mass fraction of the fatty alcohol in the coarse alkyl glucoside primary alcohol removal system, and B is the mass fraction of the fatty alcohol in the coarse alkyl glucoside primary alcohol removal system. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the existing coarse alkyl glucoside primary alcohol removal system.

[0028] Figure 2 It is Figure 1 The enlarged schematic diagram of the area shown by the dashed box a in figure 1.

[0029] Figure 3 It is a schematic diagram of the first embodiment of the utility model.

[0030] Figure 4 It is a schematic diagram of the second embodiment of the utility model.

[0031] Figure 5 It is Figure 3 And Figure 4 The enlarged schematic diagram of the area shown by the dashed box c in figure 2.

[0032] In the figure:

[0033] 100 is a falling film type column tube alcohol removal device;

[0034] The enlarged area shown by the dashed boxes a and c;

[0035] 102 is an upper tube plate;

[0036] 103 is a column tube alcohol removal device oil bath outlet;

[0037] 104 is a column tube alcohol removal device alcohol vapor outlet;

[0038] 105 is the alkyl polyglycoside material outlet channel of the column dealkanizer;

[0039] 106 is the gas-liquid separation zone in the column dealkanizer;

[0040] 107 is the lower tube sheet;

[0041] 108 is the oil bath inlet of the column dealkanizer;

[0042] 109 is the dealkanization tube;

[0043] 110 is the crude alkyl polyglycoside inlet;

[0044] 111 is the mounting plate for fixing the internal components;

[0045] 112 is the tube internal component;

[0046] 200 is the fatty alcohol condenser;

[0047] 201 is the cooling water outlet;

[0048] 202 is the condenser outlet;

[0049] 203 is the cooling water inlet;

[0050] 300 is the vacuum buffer tank;

[0051] 301 is the vacuum buffer tank outlet;

[0052] 302 is the vacuum interface;

[0053] 400 is the vacuum buffer tank outlet pump;

[0054] 500 is the alkyl polyglycoside outlet pump;

[0055] 600 is the gas-liquid separator;

[0056] 601 is the gas-liquid separator gas phase alcohol outlet;

[0057] 602 is the gas-liquid separator oil bath outlet;

[0058] 603 is the gas-liquid separator recovered alkyl polyglycoside outlet;

[0059] 604 is the gas-liquid separator oil bath inlet. DETAILED DESCRIPTION

[0060] In the embodiment, the crude alkyl polyglycoside feed of the dealkanizer is obtained by glycosidation reaction of C12-14 fatty alcohol and glucose, followed by neutralization and filtration. The main components are as follows: by weight, alkyl polyglycoside is 34.5%, fatty alcohol is 63.2%, catalyst neutralization product is 0.3%, and other impurities are 2%.

[0061] 1. Prior art implementation

[0062] Referring to Figure 1 and Figure 2 .

[0063] 1.1. Prior art implementation technical solution

[0064] The crude alkyl glycoside primary dealcoholization system comprises a crude alkyl glycoside falling film column dealcoholizer (100), the dealcoholizer comprising a container, an upper tube plate (102) and a lower tube plate (107) being arranged in the container, the container comprising three regions separated by the upper tube plate and the lower tube plate, the three regions being a crude alkyl glycoside distribution region, a dealcoholization tube heating region and a gas-liquid separation region (106) in the dealcoholizer, the crude alkyl glycoside distribution region being located above the upper tube plate, the dealcoholization tube heating region being located between the upper tube plate and the lower tube plate, and the gas-liquid separation region in the dealcoholizer being located below the lower tube plate; the crude alkyl glycoside distribution region is provided with a crude alkyl glycoside inlet (110); the container is provided with a dealcoholization tube (109), the dealcoholization tube having an upper opening and a lower opening, the upper opening of the dealcoholization tube being communicated with the crude alkyl glycoside distribution region, the upper opening of the dealcoholization tube being higher than the crude alkyl glycoside inlet (110), and the lower opening of the dealcoholization tube being communicated with the gas-liquid separation region in the dealcoholizer; the gas-liquid separation region in the column dealcoholizer is provided with a column dealcoholizer alkyl glycoside material discharge channel (105) and a column dealcoholizer alcohol vapor outlet (104).

[0065] The column dealcoholizer alcohol vapor outlet (104) is directly input into a fatty alcohol condenser (200) feed inlet.

[0066] The column dealcoholizer alkyl glycoside material discharge channel (105) is provided with an alkyl glycoside discharge pump (500).

[0067] The condenser discharge outlet (202) is input into a vacuum buffer tank (300) feed inlet.

[0068] The vacuum buffer tank (300) is provided with a vacuum interface (302).

[0069] The vacuum buffer tank (300) is provided with a vacuum buffer tank discharge outlet (301).

[0070] The vacuum buffer tank discharge outlet (301) is input into a vacuum buffer tank discharge pump (400) inlet.

[0071] 1.2. Example

[0072] 1.2.1. Equipment geometric parameters

[0073] 1.2.1.1. Geometric parameters of the crude alkyl glycoside falling film column dealcoholizer

[0074] Container: the middle part of the container is a cylinder, both ends are hemispherical, the height of the cylinder is 6m, the diameter is 1m, the lower surface of the lower tube plate is flush with the lower edge of the cylinder, and the upper surface of the upper tube plate is 50mm away from the upper edge of the cylinder

[0075] De-alcoholization pipe: the height of the de-alcoholization pipe is 6m, the inner diameter is 45mm, the number of de-alcoholization pipes is 307; the lower opening of the de-alcoholization pipe is flush with the lower surface of the lower tube plate, and the upper opening of the de-alcoholization pipe is 50mm higher than the upper surface of the upper tube plate.

[0076] 1.2.1.2. Geometric parameters of the fatty alcohol condenser (200)

[0077] Horizontal tube type condenser, total length 6m, total heat exchange area 120m 2 .

[0078] 1.2.2. Process parameters

[0079] The crude glycoside enters the de-alcoholizer at a flow rate of 800kg / h, the oil temperature of the de-alcoholizer is controlled at 165℃, the circulating water temperature of the de-alcoholization condenser is set to 25℃, and the absolute pressure of the vacuum system is 3kPa.

[0080] After testing, the de-alcoholization rate of the crude glycoside through the first de-alcoholization system is 73%, and the alkyl glycoside residue in the recovered fatty alcohol is 8.0%.

[0081] 2. The first embodiment of the present application

[0082] Referring to Figure 3 and Figure 5 .

[0083] 2.1. Technical solution

[0084] Except that the upper opening of the de-alcoholization pipe is higher than the lower surface of the upper tube plate and below the upper surface of the upper tube plate, and the in-pipe component (112) is arranged at the upper opening of the de-alcoholization pipe, the rest is the same as 1.1. Specifically:

[0085] The crude alkyl glycoside primary dealcoholization system comprises a crude alkyl glycoside falling film column dealcoholizer (100), which comprises a container, an upper tube sheet (102) and a lower tube sheet (107) arranged in the container, and three regions separated by the upper tube sheet and the lower tube sheet, namely a crude alkyl glycoside distribution region, a dealcoholization tube heating region and a gas-liquid separation region (106) in the dealcoholizer, wherein the crude alkyl glycoside distribution region is above the upper tube sheet, the dealcoholization tube heating region is between the upper tube sheet and the lower tube sheet, and the gas-liquid separation region in the dealcoholizer is below the lower tube sheet; the crude alkyl glycoside distribution region is provided with a crude alkyl glycoside inlet (110); the container is provided with a dealcoholization tube (109) having an upper opening and a lower opening, wherein the upper opening of the dealcoholization tube communicates with the crude alkyl glycoside distribution region, and the lower opening of the dealcoholization tube communicates with the gas-liquid separation region in the dealcoholizer; and the gas-liquid separation region in the column dealcoholizer is provided with a column dealcoholizer alkyl glycoside material discharge channel (105) and a column dealcoholizer alcohol vapor outlet (104).

[0086] The column dealcoholizer alcohol vapor outlet (104) directly inputs a fatty alcohol condenser (200) feed inlet.

[0087] The upper opening of the dealcoholization tube is higher than the lower surface of the upper tube sheet and below the upper surface of the upper tube sheet;

[0088] A tube internal component (112) is arranged at the upper opening of the dealcoholization tube, the tube internal component (112) extends into the dealcoholization tube from the upper opening of the dealcoholization tube, the side surface of the tube internal component has a frustum side surface shape, the top diameter of the frustum side surface is smaller than the bottom diameter, and the lower edge of the frustum side surface leaves a gap with the inner wall of the dealcoholization tube.

[0089] The axis of the frustum coincides with the axis of the dealcoholization tube.

[0090] The included angle between the generatrix of the frustum and the axis of the dealcoholization tube is α, and α is greater than 0° and less than 90°, preferably 5°-30°.

[0091] The bottom of the internal component has a curved surface that is curved upward and toward the axis of the dealcoholization tube from the lower edge line of the frustum side surface.

[0092] The included angle between the curved surface and the frustum side surface is β, and β is greater than 0° and less than 90°-α.

[0093] The column dealcoholizer alkyl glycoside material discharge channel (105) is provided with an alkyl glycoside discharge pump (500).

[0094] The condenser discharge outlet (202) inputs a vacuum buffer tank (300) feed inlet.

[0095] The vacuum buffer tank (300) is provided with a vacuum interface (302).

[0096] The vacuum buffer tank (300) is provided with a vacuum buffer tank discharge port (301).

[0097] The vacuum buffer tank discharge port (301) inputs a vacuum buffer tank discharge pump (400) inlet.

[0098] 2.2, Examples

[0099] 2.2.1, Equipment geometric parameters

[0100] 2.2.1.1, Geometric parameters of the crude alkyl glycoside falling film column dealkylator

[0101] In addition to the upper opening of the dealkylation tube being flush with the upper surface of the upper tube plate, the rest is the same as 1.2.1.1, specifically:

[0102] Container: the middle part of the dealkylation container is cylindrical, the two ends are hemispherical, the cylindrical height is 6m, the lower surface of the lower tube plate is flush with the lower edge of the cylinder, and the upper surface of the upper tube plate is 50mm away from the upper edge of the cylinder

[0103] Dealkylation tube: the dealkylation tube height is 5.95m, the inner diameter is 45mm, and the number of dealkylation tubes is 307; the lower opening of the dealkylation tube is flush with the lower surface of the lower tube plate, and the upper opening of the dealkylation tube is flush with the upper surface of the upper tube plate.

[0104] 2.2.1.2, Geometric parameters of the fatty alcohol condenser (200)

[0105] The same as 1.2.1.2. Specifically:

[0106] Horizontal tube type condenser, total length 6m, total heat exchange area 120m 2 .

[0107] 2.2.1.4, Geometric size of the tube internal component

[0108] The upper edge line of the side surface of the circular truncated cone is flush with the upper opening of the dealkylation tube; the circular truncated cone is 50mm high, the width of the gap between the lower edge line of the side surface of the circular truncated cone and the inner wall of the dealkylation tube is 5mm, the axis line of the circular truncated cone coincides with the axis line of the dealkylation tube, the included angle α between the generatrix of the circular truncated cone and the axis line of the dealkylation tube is 10°, and the bottom of the internal component has a curved surface that is curved upward from the lower edge line of the side surface of the circular truncated cone towards the axis line of the dealkylation tube and upwards, and the included angle β between the curved surface and the side surface of the circular truncated cone is 30°.

[0109] 2.2.2, Process parameters

[0110] The same as 1.2.2 process parameters. Specifically:

[0111] The crude glycosides are fed into the dehydrogenator at a flow rate of 800 kg / h. The oil temperature in the dehydrogenator is controlled at 165°C for heating and evaporation dehydrogenation. The circulating water temperature in the dehydrogenator condenser is set at 25°C, and the absolute pressure of the vacuum system is 3 kPa.

[0112] Tests showed that after primary alcohol removal, the alcohol removal rate of crude glycosides was 88%, and the residual alkyl glycosides in the recovered fatty alcohols were 7.9%.

[0113] 3. The second embodiment of this utility model

[0114] See Figure 4 and Figure 5 .

[0115] 3.1 Technical Solution

[0116] Except for the gas-liquid separator (600), everything else is the same as in 2.1. Specifically:

[0117] A primary alkyl glycoside dealcoholization system includes a crude alkyl glycoside falling film tubular dealcoholizer (100). The dealcoholizer includes a container with an upper tube sheet (102) and a lower tube sheet (107) inside. The container includes three regions separated by the upper and lower tube sheets: a crude alkyl glycoside distribution area, a dealcoholization tube heating area, and a gas-liquid separation area (106) within the dealcoholizer. The crude alkyl glycoside distribution area is located above the upper tube sheet, and the dealcoholization tube heating area is located between the upper and lower tube sheets. Between the plates, the gas-liquid separation zone inside the dehydrogenator is located below the lower tube plate; the crude alkyl glycoside feeding zone is provided with a crude alkyl glycoside inlet (110); the container is provided with a dehydrogenation tube (109), which has an upper opening and a lower opening. The upper opening of the dehydrogenation tube communicates with the crude alkyl glycoside feeding zone, and the lower opening of the dehydrogenation tube communicates with the gas-liquid separation zone inside the dehydrogenator; the gas-liquid separation zone inside the tube dehydrogenator is provided with a tube dehydrogenator alkyl glycoside material discharge channel (105) and a tube dehydrogenator alcohol vapor outlet (104).

[0118] The crude alkyl glycoside primary dealcoholization system includes a gas-liquid separator (600), with the alcohol vapor outlet (104) of the tubular dealcoholizer entering the gas-liquid separator inlet, and the gas phase alcohol outlet (601) of the gas-liquid separator entering the fatty alcohol condenser inlet. The alkyl glycoside recovery outlet (603) of the gas-liquid separator enters the alkyl glycoside material discharge channel (105) of the tubular dealcoholizer.

[0119] The upper opening of the de-alcoholization tube is higher than the lower surface of the upper tube sheet and lower than the upper surface of the upper tube sheet;

[0120] An internal component (112) is provided at the opening of the deethanolating tube. The internal component (112) extends into the deethanolating tube from the opening. The side of the internal component has the shape of a frustum. The top diameter of the frustum is smaller than the bottom diameter. The lower edge of the frustum has a gap with the inner wall of the deethanolating tube.

[0121] The axis of the circular cone coincides with the axis of the dealcoholization tube.

[0122] The angle between the generatrix of the circular cone and the axis of the dealcoholization tube is α, and α is greater than 0° and less than 90°, preferably α is 5°-30°.

[0123] The bottom of the inner member has a curved surface that is curved upward from the axis of the dealcoholization tube and upward from the lower edge line of the side surface of the circular cone.

[0124] The angle between the curved surface and the side surface of the circular cone is β, and β is greater than 0° and less than 90°-α.

[0125] The alkyl glycoside material discharge channel (105) of the tubular dealcoholization device is provided with an alkyl glycoside discharge pump (500).

[0126] The condenser discharge port (202) inputs the feed port of the vacuum buffer tank (300).

[0127] The vacuum buffer tank (300) is provided with a vacuum interface (302).

[0128] The vacuum buffer tank (300) is provided with a vacuum buffer tank discharge port (301).

[0129] The vacuum buffer tank discharge port (301) inputs the inlet of the vacuum buffer tank discharge pump (400).

[0130] 3.2, Examples

[0131] 3.2.1, Equipment geometric parameters

[0132] 3.2.1.1, Geometric parameters of the crude alkyl glycoside falling film tubular dealcoholization device

[0133] The same as 2.2.1.1. Specifically:

[0134] Container: the middle part of the dealcoholization device container is cylindrical, the two ends are hemispherical, the cylindrical height is 6m, the lower surface of the lower tube plate is flush with the lower edge of the cylinder, and the upper surface of the upper tube plate is 50mm away from the upper edge of the cylinder

[0135] Dealcoholization tube: the dealcoholization tube height is 5.95m, the inner diameter is 45mm, and the number of dealcoholization tubes is 307; the lower opening of the dealcoholization tube is flush with the lower surface of the lower tube plate, and the upper opening of the dealcoholization tube is flush with the upper surface of the upper tube plate.

[0136] 3.2.1.2, Geometric parameters of the fatty alcohol condenser (200)

[0137] The same as 1.2.1.2. Specifically:

[0138] Horizontal tubular condenser, total length 6m, total heat exchange area 120m2 .

[0139] 3.2.1.3 Geometric parameters of the gas-liquid separator (600)

[0140] The gas-liquid separator (600) is a gas-liquid static separator with a diameter of 1.1m and a height of 5.4m, and is equipped with heat-conducting oil for heating.

[0141] 3.2.1.4 Geometric dimensions of internal pipe components

[0142] Same as 2.2.1.4. Specifically:

[0143] The upper edge of the side of the frustum is flush with the opening of the deethanolination tube; the frustum is 50mm high, the width of the slit between the lower edge of the side of the frustum and the inner wall of the deethanolination tube is 5mm, the axis of the frustum coincides with the axis of the deethanolination tube, the angle α between the generatrix of the frustum and the axis of the deethanolination tube is 10°, and the bottom of the inner component has a raised curved surface extending from the lower edge of the side of the frustum toward the axis of the deethanolination tube and upward, the angle β between the curved surface and the side of the frustum is 30°.

[0144] 3.2.2 Process Parameters

[0145] Except for the addition of process parameters for the gas-liquid separator, the process parameters are the same as those in 2.2.2. Specifically:

[0146] Crude glycosides enter the dealcoholizer at a flow rate of 800 kg / h. The oil temperature in the dealcoholizer is controlled at 165°C, the circulating water temperature in the dealcoholizer condenser is set at 25°C, and the absolute pressure of the vacuum system is 3 kPa. The heat transfer oil used to heat the gas-liquid static separator is at a temperature of 165°C.

[0147] Tests showed that after primary alcohol removal, the alcohol removal rate of crude glycosides was 89%, and the residual alkyl glycosides in the recovered fatty alcohols were 0.1%.

Claims

1. A primary dealcoholization system of crude alkyl glycoside, comprising a crude alkyl glycoside falling film column dealcoholizer (100), the dealcoholizer comprising a container, an upper tube sheet (102) and a lower tube sheet (107) arranged in the container, the container comprising three regions separated by the upper tube sheet and the lower tube sheet, the three regions being a crude alkyl glycoside distribution region, a dealcoholization tube heating region and a gas-liquid separation region (106) in the dealcoholizer respectively, the crude alkyl glycoside distribution region being above the upper tube sheet, the dealcoholization tube heating region being between the upper tube sheet and the lower tube sheet, and the gas-liquid separation region being below the lower tube sheet; the crude alkyl glycoside distribution region is provided with a crude alkyl glycoside inlet (110); the container is provided with a dealcoholization tube (109) having an upper opening and a lower opening, the upper opening of the dealcoholization tube being communicated with the crude alkyl glycoside distribution region, and the lower opening of the dealcoholization tube being communicated with the gas-liquid separation region in the dealcoholizer; the gas-liquid separation region in the falling film column dealcoholizer is provided with a falling film column dealcoholizer alkyl glycoside material discharge passage (105) and a falling film column dealcoholizer alcohol vapor outlet (104); the dealcoholization system is provided with a fatty alcohol condenser (200) for condensing alcohol vapor generated by the falling film column dealcoholizer into liquid; characterized in that, the upper opening of the dealcoholization tube is higher than the lower surface of the upper tube sheet and below the upper surface of the upper tube sheet; a tube internal component (112) is arranged at the upper opening of the dealcoholization tube, the tube internal component (112) extends into the dealcoholization tube from the upper opening of the dealcoholization tube, the side surface of the tube internal component has the shape of a side surface of a rotating body, the rotating body has a top diameter smaller than a bottom diameter, and the lower edge of the side surface of the rotating body leaves a gap with the inner wall of the dealcoholization tube.

2. The dealcoholization system of claim 1, wherein, The rotating body is a circular cone or a circular truncated cone.

3. The dealcoholization system of claim 1, wherein, The falling film column dealcoholizer alcohol vapor outlet (104) directly inputs a feed inlet of the fatty alcohol condenser (200); or a gas-liquid separator (600) is arranged between the falling film column dealcoholizer alcohol vapor outlet (104) and the feed inlet of the fatty alcohol condenser, the falling film column dealcoholizer alcohol vapor outlet (104) inputs an inlet of the gas-liquid separator, and a gas phase alcohol outlet (601) of the gas-liquid separator inputs the feed inlet of the fatty alcohol condenser.

4. The dealcoholization system of claim 2, wherein, The axis of the circular truncated cone coincides with the axis of the dealcoholization tube.

5. The dealcoholization system of claim 2, wherein, An included angle between a generatrix of the circular truncated cone and the axis of the dealcoholization tube is α, and α is greater than 0° and less than 90°.

6. The dealcoholization system of claim 5, wherein, α is 5°-30°.

7. The dealcoholization system of claim 5 or 6, wherein the dealcoholization system further comprises a distillation column. The bottom of the internal component has a curved surface that is curved upward and toward the axis of the dealcoholization tube from the lower edge line of the side surface of the circular truncated cone.

8. The dealcoholization system of claim 1, wherein, The falling film column dealcoholizer alkyl glycoside material discharge passage (105) is provided with an alkyl glycoside discharge pump (500).

9. The dealcoholization system of claim 1, wherein, The condenser discharge outlet (202) inputs a feed inlet of a vacuum buffer tank (300).

10. The dealcoholization system of claim 9, wherein, The vacuum buffer tank (300) is provided with a vacuum interface (302).

11. The dealcoholization system of claim 9, wherein, The vacuum buffer tank (300) is provided with a vacuum buffer tank discharge outlet (301).

12. The dealcoholization system of claim 11, wherein, The vacuum buffer tank discharge outlet (301) inputs an inlet of a vacuum buffer tank discharge pump (400).

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