Automatic system for stable control of epichlorohydrin feeding

Abstract

The utility model relates to an automatic system for stable control of epichlorohydrin feeding. A dichloropropanol temporary storage tank; a water phase storage tank, a water phase conveying pump, a water phase flowmeter and a water phase regulating valve are sequentially arranged on the water phase overflow pipeline in the fluid conveying direction; an oil phase storage tank, an oil phase delivery pump, an oil phase flowmeter and an oil phase regulating valve are arranged on the oil phase overflow pipeline; a discharge line; and the discharge end of the 25% liquid caustic soda line is connected to the discharge line between the pump and the static mixer. According to the improvement, by using an oil-water separation device of dichloropropanol, the proportion of a water phase in raw materials is reduced, part of hydrogen chloride in the water phase is separated from a system, the use amount of liquid caustic soda in a subsequent cyclization stage is reduced, and the production cost is reduced; the oil-water reproportioning of dichloropropanol can ensure the relative stability of the components of dichloropropanol, is beneficial to parameter control in the cyclization stage, improves the automation level of a workshop, and increases the safety of continuous production.

Description

TECHNICAL FIELD

[0001] The utility model relates to epoxy chloropropane production equipment technical field, concretely for a kind of for epoxy chloropropane feeding stable control's automation system. BACKGROUND

[0002] Epoxy chloropropane is important organic chemical raw material and fine chemical product, mainly used for producing epoxy resin, in addition, it can also be used for producing nitroglycerin explosive, chlorohydrin rubber, glycidyl ether, surfactant, paper wet strength enhancer (amide epoxy chloropropane resin), water treatment agent, flame retardant, quaternary ammonium salt, ion exchange resin, plasticizer and a variety of products, also have certain consumption in medicine, pesticide, solvent, special adhesive etc.

[0003] Glycerol method prepares epoxy chloropropane, mainly divided into hydrogen chlorine reaction synthesis analysis section, hydrogen chloride and glycerol reaction chlorination section and chlorination produced dichloropropanol and liquid alkali reaction cyclization section.

[0004] Because dichloropropanol produced by chlorination is layered into oil phase and water phase, wherein oil phase composition is about: 82% dichloropropanol, 3% hydrogen chloride, 13.5% moisture and other substances;And water phase composition is about 22.5% dichloropropanol, 14.5% hydrogen chloride, 61.5% moisture and other substances. Because of the difference between oil phase and water phase composition, using centrifugal pump directly to transport can be into water phase after oil phase is pumped empty, leading to unstable dichloropropanol composition into cyclization, which can increase side reaction, affect product yield.

[0005] In order to solve the above problems, improve the automation degree of ECH production, reduce the risk of safety and environmental protection, improve on the basis of existing process. INVENTION CONTENTS

[0006] The technical problem to be solved by the utility model is to reduce the proportion of water phase in raw materials, remove part of hydrogen chloride in water phase from the system, and reduce the amount of liquid alkali in the subsequent cyclization stage, thereby providing an automation system for stable control of epoxy chloropropane feeding.

[0007] The technical problem to be solved by the utility model is solved by the following technical scheme, an automation system for stable control of epoxy chloropropane feeding, the automation system comprises;

[0008] Dichloropropanol temporary storage tank;

[0009] Water phase overflow pipeline, its feeding end is connected to the middle part of the outer wall of dichloropropanol temporary storage tank, and water phase storage tank, water phase conveying pump, water phase flow meter and water phase regulating valve are sequentially arranged on the water phase overflow pipeline according to fluid conveying direction;

[0010] An oil phase overflow pipeline is connected to the other side middle part outer wall of the dichloropropanol temporary storage tank, the feeding end of the oil phase overflow pipeline is arranged lower than the feeding end of the water phase overflow pipeline, and the oil phase storage tank, the oil phase conveying pump, the oil phase flow meter and the oil phase regulating valve are sequentially arranged on the oil phase overflow pipeline in the fluid conveying direction;

[0011] A discharge line is connected to the feeding end of the water phase overflow pipeline and the feeding end of the oil phase overflow pipeline, and the centrifugal pump and the static mixer are sequentially arranged on the discharge line in the fluid conveying direction.

[0012] 25% liquid alkali line is connected to the discharge line between the pump and the static mixer.

[0013] The technical problems to be solved by the utility model can also be solved by the following technical scheme, the above-mentioned automatic system for stabilizing and controlling epoxy chloropropane feeding, the front part of the oil phase overflow pipeline is provided with an underflow pipe and a pressure balance pipe.

[0014] One end of the underflow pipe is connected to the bottom of the dichloropropanol temporary storage tank, and the other end is connected to the feeding end of the oil phase overflow pipeline.

[0015] One end of the pressure balance pipe is connected to the top of the dichloropropanol temporary storage tank, and the other end is connected to the feeding end of the oil phase overflow pipeline.

[0016] Compared with the prior art, the utility model has the beneficial technical effects that: the improved oil-water separation device for dichloropropanol reduces the proportion of water phase in raw materials, removes part of hydrogen chloride in the water phase from the system, reduces the amount of liquid alkali in the subsequent cyclization stage, and reduces production cost; the oil-water re-proportioning of dichloropropanol can ensure the relative stability of its components, is conducive to parameter control in the cyclization stage, improves the automation level of the workshop, and increases the safety of continuous production. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The utility model is a pipeline connection diagram.

[0018] Fig. 1 is a dichloropropanol temporary storage tank; 2, a water phase overflow pipeline; 3, a water phase storage tank; 4, a water phase conveying pump; 5, a water phase flow meter; 6, a water phase regulating valve; 7, an oil phase overflow pipeline; 8, an oil phase storage tank; 9, an oil phase conveying pump; 10, an oil phase flow meter; 11, an oil phase regulating valve; 12, an underflow pipe; 13, a pressure balance pipe; 14, a discharge line; 15, a centrifugal pump; 16, a static mixer; 17, a 25% liquid alkali line. DETAILED DESCRIPTION

[0019] The specific technical scheme of the utility model is further described below with reference to the drawings, so that those skilled in the art can further understand the utility model without limiting the rights thereof.

[0020] Example 1, Reference Figure 1 An automatic system for the stable control of epichlorohydrin feed, the automatic system comprising;

[0021] A dichloropropanol temporary storage tank 1 formed as a substantially tank structure;

[0022] A water phase overflow pipeline 2, the feed end of which is connected to the middle outer wall of the dichloropropanol temporary storage tank 1, and on which, in the fluid conveying direction, a water phase storage tank 3, a water phase conveying pump 4, a water phase flow meter 5 and a water phase regulating valve 6 are sequentially arranged;

[0023] An oil phase overflow pipeline 7, the feed end of which is connected to the other side middle outer wall of the dichloropropanol temporary storage tank 1, the installation height of the feed end of which is lower than that of the feed end of the water phase overflow pipeline 2, and on which, in the fluid conveying direction, an oil phase storage tank 8, an oil phase conveying pump 9, an oil phase flow meter 10 and an oil phase regulating valve 11 are sequentially arranged;

[0024] The front part of the oil phase overflow pipeline 7 has a lower overflow pipe 12 and a pressure balance pipe 13, one end of the lower overflow pipe 12 being connected to the bottom of the dichloropropanol temporary storage tank 1 and the other end being connected to the feed end of the oil phase overflow pipeline 7, one end of the pressure balance pipe 13 being connected to the top of the dichloropropanol temporary storage tank 1 and the other end being connected to the feed end of the oil phase overflow pipeline 7;

[0025] A discharge line 14, the discharge ends of the water phase overflow pipeline 2 and the oil phase overflow pipeline 7 being connected to the feed end of the discharge line 14, and on the discharge line 14, in the fluid conveying direction, a centrifugal pump 15 and a static mixer 16 are sequentially arranged;

[0026] A 25% liquid alkali line 17, the discharge end of which is connected to the discharge line 14 between the pump and the static mixer 16.

[0027] The improvement is to add the water phase overflow pipeline 2 above the dichloropropanol temporary storage tank 1, and by virtue of the feature that the oil phase has a higher density than the water phase, when the liquid level reaches the set height, the water phase automatically overflows from the water phase overflow pipeline 2 into the water phase storage tank 3; the lower overflow pipe 12 is connected below the dichloropropanol temporary storage tank 1, and the set height of the feed end of the oil phase overflow pipeline 7 is slightly lower than that of the feed end of the water phase overflow pipeline, and it is satisfied that when the feed end of the water phase overflow pipeline 2 is full of oil phase, the oil phase can flow into the oil phase storage tank 8 through the lower overflow pipe 12 and the oil phase overflow pipeline 7, and the materials in the oil phase storage tank 8 and the water phase storage tank 3 can be conveyed by the centrifugal pump 15 respectively, and after being mixed in proportion by the static mixer 16, they enter the cyclization section, to ensure the continuous production of the cyclization section;

[0028] The improvement reduces the proportion of water phase in the raw material by using the oil-water separation device of dichloropropanol, removes part of hydrogen chloride in the water phase from the system, reduces the amount of liquid alkali in the subsequent cyclization stage, and reduces the production cost; the oil-water re-proportioning of dichloropropanol can ensure the relative stability of its components, which is beneficial to the parameter control in the cyclization stage, improves the automation level of the workshop, and increases the safety of continuous production.

Claims

1. An automated system for the stable control of epichlorohydrin feed, characterized by: The automation system comprises; The dichloropropanol temporary storage tank; The water phase overflow pipeline has its feeding end connected to the middle outer wall of the dichloropropanol temporary storage tank, and is sequentially provided with a water phase storage tank, a water phase conveying pump, a water phase flow meter and a water phase regulating valve in the fluid conveying direction; The oil phase overflow pipeline has its feeding end connected to the other middle outer wall of the dichloropropanol temporary storage tank, and is sequentially provided with an oil phase storage tank, an oil phase conveying pump, an oil phase flow meter and an oil phase regulating valve in the fluid conveying direction; The discharge line has its feeding end connected to the feeding ends of the water phase overflow pipeline and the oil phase overflow pipeline, and is sequentially provided with a centrifugal pump and a static mixer in the fluid conveying direction; The 25% liquid alkali line has its feeding end connected to the discharge line between the pump and the static mixer.

2. An automated system for the stable control of epichlorohydrin feed according to claim 1, characterized in that: The front part of the oil phase overflow pipeline has a lower overflow pipe and a pressure balance pipe; One end of the lower overflow pipe is connected to the bottom of the dichloropropanol temporary storage tank, and the other end is connected to the feeding end of the oil phase overflow pipeline; One end of the pressure balance pipe is connected to the top of the dichloropropanol temporary storage tank, and the other end is connected to the feeding end of the oil phase overflow pipeline.

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