SU831156A1

SU831156A1 - Method of cleaning ventilation system exaust air at phenol-formaldehide resin production

Info

Publication number: SU831156A1
Application number: SU792735298A
Authority: SU
Inventors: Анатолий Матвеевич Юферов; Евгений Анатольевич Юферов
Priority date: 1979-03-11
Filing date: 1979-03-11
Publication date: 1981-05-23

Description

(54) СПОСОБ ОЧИСТКИ ВОЗДУШНЫХ ВЫБРОСОВ ВЕНТИЛЯЩЮННЫХ СИСТЕМ ПРОИЗВОДСТВА ФЕНОЛФОРМАЛЬДЕГИДНЫХ СМОЛ(54) METHOD OF CLEANING AIR EMISSIONS OF VENTILATING SYSTEMS OF MANUFACTURE OF PHENOLFORMALDEHYDE RESINS

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Изобретение относитс к очистке воздушных выбросов химических производств и может быть использовано дл очистки отход щих газов производства фенолформальдегидных смол.The invention relates to the purification of air emissions from chemical plants and can be used to purify waste gases from the production of phenol-formaldehyde resins.

Известен способ очистки воздушных выбросов химического производства от фенола .путем абсорбции последнего надсмольной водой, образующейс в производстве фенолформальдегидных смол 1 .A known method for purifying aerial emissions of chemical production from phenol. By absorbing the latter with supersized water formed in the production of phenol-formaldehyde resins 1.

Недостатком этого способа вл етс загр знение очищаемого воздуха формальдегидом, содержащимс надсмольной воде в количестве 1,5-6%. Кроме того, высокое содержание фенола в абсорбенте не позвол ет достигнуть высокой степени очистки.The disadvantage of this method is the contamination of the purified air with formaldehyde containing 1.5-6% over-resin water. In addition, the high content of phenol in the absorbent does not allow to achieve a high degree of purification.

Известен также способ очистки воздушных выбросов вентил ционных систем производства фенолформальдегидных смол путем абсорбции раствором щелочи, например гищэоокиси натри 2.There is also known a method of cleaning airborne emissions from phenol-formaldehyde resin ventilation systems by absorption with an alkali solution, for example sodium hydroxide 2.

Однако указанный способ не обеспечивает очистку воздушных выбросов от содержащегос в них формальдегида, что приводит к тому, что очищенный воздух не может бытьHowever, this method does not ensure the purification of air emissions from the formaldehyde contained in them, which leads to the fact that the purified air cannot be

использован дл питани систем приточной вентил ции и создани замкнутых вентил ционных систем. Позвол ющих исключить поступление вредных веществ в окружающую атмосферу.used to power supply ventilation systems and create closed ventilation systems. Allowing you to eliminate the ingress of harmful substances into the surrounding atmosphere.

Цель изобретени - обеспечение очистки воздушных выбросов от примесей формальдегида .The purpose of the invention is to ensure the purification of air emissions from formaldehyde impurities.

Поставленна цель. достигаетс тем, что исходный газ предварительно промывают водным раствором щелочи, содержащим 2-3% фенол та Натри .Set a goal. is achieved by the fact that the source gas is pre-washed with an aqueous alkali solution containing 2-3% phenol Sodium.

При этом между формальдегидом и фенол том протекает необратима реакци с образованием первичных продуктов поликонденсации . 2-3%-на концентраци фенол та натри в водном растворе целочи оОеспечивает полное удаление формальдегида из очищаемого воздуха.Moreover, between formaldehyde and phenol the reaction proceeds irreversibly with the formation of primary products of polycondensation. 2-3% concentration of phenol and sodium in an aqueous solution of whole; It ensures the complete removal of formaldehyde from the purified air.

Claims

Example 1. Air from the production premises of the phenol-formaldehyde resin shop, containing 0.2 mg / m of phenol and 0.4 mg / m of formaldehyde, is fed to the bottom with a spherical nozzle at a speed of 6 m / s at 20 ° C. Scrubber top irrigate with an aqueous solution of alkali with a specific irrigation of 0.5 l / m. In the second scrubber, phenol is captured, the alkali solution is circulated in the scrubber to a concentration of the resulting phenol of 0.1%, after which the solution is removed from the scrubber for processing. Purified from formaldehyde and phenol and sodium are washed with water to remove alkaline aerosols. The content of phenol and formaldehyde in purified air is not chromatographically detected. The concentration of phenol sodium in a 1525% aqueous alkali solution below 2–3% does not provide the necessary reaction rate, and a higher concentration leads to a significant secondary pollution of the air being cleaned. Example 2. Air containing 0.5 mg / m of formaldehyde and 0.3 mg / m of phenol at 20 ° C is washed in a scrubber with a ball nozzle with a 20% alkaline solution containing 2.5% sodium phenol and specific irrigation 0 , 6 l / m and air speed 5 m / s. Further, the process is carried out according to Example 1. The content of phenol and formaldehyde in the purified air is not chromatographically detected. Example 3. Air containing 6 mg / m of formaldehyde and 0.4 mg / m of phenol is washed at 20 ° C in a scrubber with a 259 amply alkali solution with a balm cap containing 3% sodium phenol and irrigation 0.6. , l / m and air velocity of 6 m / s. Further, the process is carried out according to Example 1. The content of phenol and formaldehyde in the purified air was not detected by chromatography. Claims The method of cleaning air emissions of phenol-formaldehyde resin production ventilation systems by absorption with an alkali solution, characterized in that, in order to ensure the removal of formaldehyde from impurities, the source gas is pre-washed with an aqueous alkali solution containing 2-3% sodium phenol. Sources of information taken into account during the examination 1. USSR author's certificate No. 144023, cl. C 07 C, 37/22, 1962.

2. Dirns A., Kubichka R. Phenols and coal bases. M., 1958, p. 51 (prbtotip).