CN1046325A - A kind of acrylic acid production device that adopts the titanium material - Google Patents

Abstract

The invention provides a kind of acrylic acid production device.This apparatus features be the equipment of crevice corrosion medium or wherein the part parts adopt titanium material or titanium, carbon steel, titanium, the compound structure of stainless steel.Make this device erosion resistance strong, durable in use, continuous operation time is long, saves equipment replacement expense and materials consumption, reduces the loss that stops production, and help to ensure quality product, avoided since the evaporating, emitting, dripping or leaking of liquid or gas that equipment corrosion causes to pollution and the accident potential of environment.

Description

A kind of acrylic acid production device that adopts the titanium material

The invention relates to a kind of acrylic acid production device

Acrylic acid production device by absorption tower [T-101], gas stripping column [T-102], extraction tower [T-103], solvent recovery tower [T-104], separated from solvent tower [T-105], cut light tower [T-106], take off heavies column [T-107], rectifying tower [T-108], acetic acid separated tower [T-109] and accessory interchanger, jar, pump, valve, pipeline etc. are formed separately.Working medium vinylformic acid and acetic acid in this device are strong corrosive media.Therefore the material that adopts of acrylic acid production device and structure work-ing life of just having determined this device, the replacement cycle of equipment.We expect the continuous operation of this device energy long period, save the equipment replacement expense and reduce the loss that stops production and cause.

In prior art, method for production of acrylic acid (Japanese Patent No. 759459, the special public clear 49-24989 of notification number) equipment that adopts adopts stainless steel, corrosion especially severe position to adopt special stainless steel NAS144M at corrosion location, as separated from solvent tower (T-105 tower) totally five ten layers of column plate, the 30 layers of column plate in bottom adopt NAS144M, all the other 20 layers of column plates adopt Ultralow Carbon Stainless Steel SuS316L, this tower uses and only uses 296 days, the column plate seriously corroded, the hole diameter of sieve (perforated) plate φ 12mm of column plate, being corroded becomes the hole of φ 15mm.Column plate thickness corrodes attenuation by 3mm, and thickness only has 1.2mm, interchanger E-1371 and for example, and former employing special stainless steel NAS144M uses the damage that promptly is corroded in 2 years 07 months.Adopt common stainless steel 1Cr18Ni9, using promptly was corroded in one month penetrates.Because vinylformic acid refining plant contact strong corrosive media, and existing technology equipment therefor is because of its erosion resistance the subject of knowledge and the object of knowledge limit, work-ing life is short, the replacement cycle of equipment is short, the frequent replacing of equipment heightens manufacturing, replacing, the installation costs of equipment, also make stopping production often, the loss that stops production increases.Because equipment corrosion easily causes evaporating, emitting, dripping or leaking of liquid or gas, contaminate environment, and the hidden danger that causes the accident.

The purpose of the invention is to provide a kind of corrosion resistance and good, the vinylformic acid refining plant of long service life.Prolong its work-ing life, reduce the stopping production loss that causes because of the equipment of changing corrosion damage, reduce the equipment purchasing installation and change required human and material resources consumption.

The purpose of the invention is achieved in that the position that tower, jar, interchanger, pump, valve, pipeline of vinylformic acid refining plant etc. contacts with vinylformic acid, acetic acid all adopts the titanium material to make.Can adopt pure titanium, also can adopt the composition board of titanium and stainless composition board or titanium and carbon steel to make.The one side titanium plate that composition board contacts with vinylformic acid or acetic acid, what one side did not contact vinylformic acid, acetic acid in addition is available stainless steel or carbon steel.Titanium has favorable mechanical performance and physicals, and machine-shaping property is also better, is convenient to make processing.The titanium material has the superior corrosion resistance energy, and erosion resistance is heat-treated not generally, and factor affecting such as moulding, welding have the ability that avoids spot corrosion and intergranular corrosion.Need use rare gas element such as argon shield during the welding of titanium material.The titanium material is low weight, though the price of titanium material own is more expensive, the equipment of use titanium material manufacturing is more or less the same than the facility investment of the same race of stainless material.

The invention has prolonged the work-ing life of this device because the erosion resistance of vinylformic acid refining plant is provided, and has reduced more exchange device number of times, economizes on the use of funds and makes, and changes the manpower and materials consumption of erecting equipment.Prolong the continuous operation time of this device, reduced the loss that stops production and bring.Reduce production costs, raise the efficiency.This device satisfies former processing requirement, because the impurity of having avoided the slave unit internal corrosion to get off is sneaked in the product, helps guaranteeing the quality of product.

Accompanying drawing 1 is the composition diagram of vinylformic acid refining plant.This device absorbs, captures vinylformic acid by absorption tower [T-101] water, after entering gas stripping column [T-102] and removing unabsorbed all gases, extraction tower [T-103] with solvent carry out vinylformic acid and acetic acid extracting, take out raffinate and therefrom reclaim solvent by solvent recovery tower [T-104].Extract enters separated from solvent tower [T-105] and carries out separated from solvent.Then at cut light tower [T-106] separating acetic acid, enter the refining vinylformic acid of rectifying tower [T-108] after heavies column [T-107] is removed heavy constituent and use taking off for polymerization.Acetic acid separated tower [T-109] is from the distillate acrylic acid of [T-106].

Accompanying drawing 2 is the sectional views according to an embodiment-interchanger main body of the invention proposition.Be illustrated as a tubular heat exchange main body, be welded into the interchanger main body with tube sheet by case body [3], tubulation [8].Hand hole [2], [4], steam-in [7], thermometer mouth [9] are arranged on the heat exchanger shell [3].Upper and lower tube sheet adopts composite structure: the lower tubesheet of carbon steel [1] is compound with the following composition board [10] that the titanium material is manufactured.The last composition board [6] that upper tubesheet of carbon steel [5] and titanium material are manufactured is compound.Tubulation [8] is made by the titanium material.All the other housings are manufactured by carbon steel.

Embodiment 1: the separated from solvent tower [T-105] in the vinylformic acid refining plant adopts stainless steel to make seriously corroded in the use.The most following five layers of column plate are corrosion damage, and it is big that the sieve plate hole becomes, the attenuation of column plate thickness, the column plate big area that has perforation, will the most following five layers of column plate and annex all change the titanium material into and make, use and do not see evidence of corrosion in 2 years.

Embodiment 2: the interchanger in the vinylformic acid refining plant [E-1371] adopts stainless steel NAS144M to use and promptly used stainless steel 1Cr18Ni9 instead because of heavy corrosion damages in 2 years seven months, uses an i.e. corrosion in month to penetrate.Changed three interchanger in nine months altogether.Adopting the interchanger shown in the accompanying drawing 2, because of being steam between this Tube Sheet of Heat Exchanger, is corrosive medium in the pipe, and tubulation adopts the titanium material to make.Upper and lower tube sheet adopts composite structure.The carbon steel sheet thick by the thick titanium plate of 10mm and 40mm is composited.The one side of crevice corrosion medium is manufactured for the titanium material, and all the other housings etc. are manufactured by carbon steel.Argon arc welding under the protection of inert gas that the welding of titanium material is adopted.This interchanger used 2 years, did not see evidence of corrosion, and other interchanger [E-138], [E-129] also use the interchanger with [E-1371] same material and structure instead.Respond well.Other interchanger can adopt the titanium carbon steel compound according to the different situations part parts of its crevice corrosion medium, also can adopt the compound or industrially pure titanium of titanium stainless steel.Also can be all to adopt industrially pure titanium to make.

Equipment component or armamentarium adopt the vinylformic acid refining plant of titanium material or the compound formation of titanium, have good corrosion resistance, and be durable in use, is to be applicable to that vinylformic acid is refining.Other organic chemical industry's refining plants of handling corrosive medium also can adopt.The manufacturing of saving equipment, replacement charge and materials consumption, the loss that reduce to stop production, and the impurity of having avoided the slave unit internal corrosion to get off sneaks in the product, helps to ensure quality product.

Claims (2)

1, a kind of acrylic acid production device, by absorption tower [T-101], gas stripping column [T-102], extraction tower [T-103], molten Ji recovery tower [T-104], molten Ji knockout tower [T-105], cut light tower [T-106], take off heavies column [T-107], rectifying tower [T-108], acetic acid separated tower [T-109] and interchanger, jar, pump, the pipeline supporting with it formed, it is characterized in that equipment or its part parts employing titanium material that this refining plant contacts with vinylformic acid, acetic acid make.

2, acrylic acid production device according to claim 1 is characterized in that adopting the industrially pure titanium material, also can adopt the titanium material, also can adopt the compound or compound structure of stainless steel of titanium and carbon steel.The one side of crevice corrosion medium is that titanium layer, another side are carbon steel or stainless steel layer.

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