LT4250B - Method for purification of waste gas from phenol and formaldehyde - Google Patents

Method for purification of waste gas from phenol and formaldehyde Download PDF

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Publication number
LT4250B
LT4250B LT96-024A LT96024A LT4250B LT 4250 B LT4250 B LT 4250B LT 96024 A LT96024 A LT 96024A LT 4250 B LT4250 B LT 4250B
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LT
Lithuania
Prior art keywords
formaldehyde
phenol
urea
hydrogen peroxide
mineral wool
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LT96-024A
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Lithuanian (lt)
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LT96024A (en
Inventor
Rene Uginciene
Vanda Maceikiene
Kestutis Eidukevicius
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Termoizoliacijos Inst
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Priority to LT96-024A priority Critical patent/LT4250B/en
Publication of LT96024A publication Critical patent/LT96024A/en
Publication of LT4250B publication Critical patent/LT4250B/en

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Abstract

This invention makes it possible to remove the phenol and formaldehyde out of exhaust gas of mineral wool production. The hydrogen peroxide with 3% addition of divalent ferrous chloride and carbamate with ammonia phosphate at a ratio of 1:1 is used for that purpose.

Description

Išradimas priklauso statybinių medžiagų pramonei, naudojamas gaminant mineralinės vatos gaminius.The invention relates to the building materials industry used in the manufacture of mineral wool products.

Iš SU autorinio liudijimo Nr. 867 404 išradimo aprašymo žinomas išmetamijjų dujų valymo būdas nuo formaldehido sorbcijos metodu. Pro kolonėlę, pripildytą sausų medžiagų karbamido ir amofoso santykiu 1:1, iš pradžių praleidžiami vandens garai, o po to formaldehidas reaguoja su užpildytomis medžiagomis.Sio valymo būdo trūkumas tas, kad galima išvalyti dujas tik nuo formaldehido.From SU copyright no. 867 404 of the invention discloses a known method for purifying the exhaust gas from formaldehyde by sorption. A column filled with a 1: 1 ratio of urea to amophos in dry solids first passes water vapor and then reacts with formaldehyde with the fillers.

Japonijos patento Nr. 51-44898 aprašyme pateiktas išmetamųjų dujų valymo būdas nuo technologinių dujų fenolio ir formaldehido praplovimo metodu. Per indą, pripildytą vandenilio peroksido su dvivalentės geležies druska, kur Fe++ jonų koncentracija sudaro 1/7 peroksido koncentracijos, praleidžiamos fenolio ir formaldehido dujos. Šiame pripildytame skysčio inde ir vyksta reakcija.Šio valymo būdo trūkumas tas, kad susidaro didelis kiekis panaudotų vandeninių tirpalų.Japanese patent no. 51-44898 discloses a method for purifying waste gas from process gas by a phenol and formaldehyde purge method. Phenol and formaldehyde gas are passed through a vessel filled with hydrogen peroxide with a divalent iron salt where the Fe ++ ion concentration is 1/7 peroxide. The reaction is complete in this filled liquid container. The disadvantage of this method of purification is the large amount of aqueous solutions used.

Išradimo uždavinys - supaprastinti valymo procesą, išvengiant nutekamų vandenų susidarymo.The object of the invention is to simplify the purification process by avoiding the formation of wastewater.

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Sį uždavinį išsprendžia išmetamijjų dujų nuo fenolio ir formaldehido valymo būdas, praleidžiant jas pro mineralinės vatos plokštes, supurkštas 20-5Og 3%-niu vandenilio peroksidu su 3% FeCl2 4H2O priedu bei 20%-niu karbamido su amofosu (1:1) vandeniniu tirpalu.This problem is solved by a method of purifying the exhaust gases from phenol and formaldehyde by passing them through mineral wool slabs sprayed with 20-5Og of 3% hydrogen peroxide with 3% FeCl 2 4H 2 O and 20% urea with amophos (1: 1). ) in aqueous solution.

Pasiekiami pranašumai pasireiškia tuo, kad mineralinės vatos plokštės tarnauja kaip indas palaikyti skysčiui, kuriame ant mineralinės vatos plaušo vyksta skysčio reakcija su fenoliu ir formaldehidu.Geležies silikatas, kurio yra plauše, tarnauja kaip katalizatorius. Skysčiu naudojamas vandenilio peroksidas su 3% FeQ2 4H2O priedu ir 20%-nis karbamido su amofosu vandeninis tirpalas.Advantages achieved are that mineral wool panels serve as a vessel for maintaining a fluid in which the mineral wool fiber undergoes a reaction of the liquid with phenol and formaldehyde. The iron silicate in the fiber serves as a catalyst. The liquid used is hydrogen peroxide with 3% FeQ 2 4H 2 O and 20% aqueous solution of urea with amofos.

Vandenilio peroksidas fenolį oksidina iki fenoksūinio radikalo, kuriems susijungus susidaro stabilus produktas. Formaldehidui reaguojant su karbamidu ir amofosu taip pat susidaro stabilus produktas - heksametilentetraminas.Hydrogen peroxide oxidizes phenol to a phenoxy radical which, when combined, produces a stable product. Formaldehyde also reacts with urea and amofos to form a stable product, hexamethylenetetramine.

Naudotų medžiagų charakteristika:Characteristics of materials used:

Fenolis GOST6417-72, formalinas GOST 1625-89, karbamidas GOST 2081-92, vandenilio peroksidas GOST 10929-76, amofosas GOST 3772-74.Phenol GOST6417-72, formalin GOST 1625-89, urea GOST 2081-92, hydrogen peroxide GOST 10929-76, amophos GOST 3772-74.

Formaldehido kiekį nustatinėjome fotokolorimetriniu metodu, naudodami fenilhidrazino hidrochloridą. Fenolio kiekį nustatinėjome taip pat fotokolorimetriniu metodu, naudodami diazoparanitroaniliną.Formaldehyde content was determined by photochromimetry using phenylhydrazine hydrochloride. Phenol content was also determined by photochromimetry using diazoparanitroaniline.

Pralaidumo koeficientą matavome spektrometru Gb-46.The transmittance was measured with a Gb-46 spectrometer.

Pavyzdys Nr.l. Tyrimams naudojamas eksikatorinis metodas. Jo esmė: fenolis ir formalinas supilamas po mineralinės vatos plokšte, supurkšta surišančia dujas medžiaga, eksikatoriuje, kuris sandariai uždaromas ir po tam tikro laiko per absorberius siurbiamas oras 30min. ll/min. greičiu. Žiūrima, kiek dujų praeina pro mineralinės vatos plokštes. Skaičiavimuose naudojamas prisotinimo koeficientas 3.4 m /m (santykis pavyzdžio ploto su eksikatoriaus tūriu).Example No. 1 For research, the desiccator method is used. Its essence: phenol and formalin are poured under a plate of mineral wool, sprayed with a binder gas, in a desiccator, which is sealed and after some time the air is absorbed through the absorbers for 30 minutes. II / min. speed. It is observed how much gas passes through mineral wool slabs. A saturation factor of 3.4 m / m (ratio of sample area to desiccator volume) is used in the calculations.

Kiti pavyzdžiai analogiški pirmam pavyzdžiui. Rezultatai 1 lentelėje.Other examples are analogous to the first example. Results in Table 1.

lentelėtable

Surišanti medžiaga Binding material dujas gas Fenolio išsiskyrimas po apipurškimo, mg/m2 Phenol release after spraying, mg / m 2 Formaldehido išsiskyrimas po apipurškimo, mg/m2 Formaldehyde release after spraying, mg / m 2 Pavadinimas The title Kiekis, 8 Quantity, 8th 30 min. 30 min 1 vai. 1 or. 3 vai. 3 or. 1 para 1 day 30 min. 30 min 1 vai. 1 or. 3 vai. 3 or. 1 para 1 day h2o2 h 2 o 2 0 0 5.44 5.44 5.43 5.43 5.42 5.42 5.44 5.44 4.63 4.63 4.80 4.80 5.33 5.33 5.11 5.11 +3%FeCl2 + 3% FeCl 2 10 10th - - - - - - - - 0.05 0.05 0.09 0.09 0.095 0.095 0.08 0.08 4H2O4H 2 O 20 20th 2.53 2.53 1.85 1.85 1.65 1.65 1.59 1.59 0 0 0 0 0 0 0 0 30 30th 1.25 1.25 1.00 1.00 0.80 0.80 0.98 0.98 0 0 0 0 0 0 0 0 40 40 0.71 0.71 0.45 0.45 0.25 0.25 0.50 0.50 0 0 0 0 0 0 0 0 50 50 0.69 0.69 0.40 0.40 0.18 0.18 0.36 0.36 0 0 0 0 0 0 0 0 55 55 - - - - - - - - 0 0 0 0 0 0 0 0 H2O2+3%H 2 O 2 + 3% 0 0 1.90 1.90 1.90 1.90 1.90 1.90 1.92 1.92 - - - - - - FeCl2. 4H2OFeCl 2 . 4H 2 O 50 50 0.68 0.68 0.37 0.37 0.17 0.17 0.35 0.35 0 0 0 0 0 0 0 0 20%-nis 20% 0 0 1.90 1.90 1.91 1.91 1.90 1.90 1.90 1.90 4.62 4.62 4.83 4.83 5.33 5.33 5.10 5.10 karbamido su of urea with 10 10th - - - - - - - - 0.065 0.065 0.070 0.070 0.085 0.085 0.094 0.094 amofosu amofos 20 20th - - - - - - - - 0 0 0 0 0 0 0 0 vandeninis aqueous 30 30th - - - - - - - - 0 0 0 0 0 0 0 0 tirpalas solution 40 40 - - - - - - - - 0 0 0 0 0 0 0 0 50 50 0.30 0.30 0.32 0.32 0.35 0.35 0.35 0.35 0 0 0 0 0 0 0 0 55 55 - - - - - - - - 0 0 0 0 0 0 0 0

Kaip matyti 1 lentelėje, įpurškimas 20 - 50 g 3% vandenilio peroksido suAs shown in Table 1, injection of 20-50 g of 3% hydrogen peroxide with

3%FeCl2 4H2O ir 20%-nio karbamido su amofosu vandeninio tirpalo žymiai sumažina fenolio kiekį ir visai suriša formaldehido dujas.An aqueous solution of 3% FeCl2 4H2O and 20% aqueous urea with amofos significantly reduces phenolic content and completely binds formaldehyde gas.

Tačiau fenolio ir formaldehido surišimas priklauso nuo absorbuojančių medžiagų kiekio ( žiūr. 1 lentelę ). Įpurškus lOg lieka nesurišto formaldehido, o įpurškus ne mažiau 20g absorbuojančių medžiagų, formaldehidas visai surišamas. Kaip matyti 1 lentelėje, kuo daugiau įpurškiama absorbuojančių medžiagų, tuo greitesnis surišimas. Maksimaliu kiekiu laikom 50g, nes padidinti absorbuojančių medžiagų kiekį neekonomiška.However, the binding of phenol and formaldehyde depends on the amount of absorbent material (see Table 1). Injection of 10g leaves unbound formaldehyde, and injection of at least 20g of absorbent material binds the formaldehyde completely. As shown in Table 1, the more absorbent materials are injected, the faster the binding. The maximum amount is 50g because it is uneconomic to increase the amount of absorbents.

Pramoniniam išbandymui buvo padarytas maketas, kuris sudarytas iš metalinio karkaso su įstatyta į jį mineralinės vatos plokšte, supurkšta 3% FeQ2-4H2O priedu ir 20%-niu karbamido su amofosu vandeniniu tirpalu. Išpurškimui sunaudota 0.51/m .Pavyzdžiuose mineralinės vatos plokščių prisotinimo gylis po apipurškimo siekė 20mm. Dujos, turinčios formaldehido ir fenolio (1.5 ir 1.6 mg/m3 atatinkamai), buvo praleistos per filtrą 300 mg/val greičiu. Praėjusiose dujose fenolio ir formaldehido nerasta.For industrial testing, a model was made of a metal frame with a mineral wool slab embedded in it, sprayed with 3% FeQ2-4H2O additive and 20% aqueous urea with amofos. 0.51 / m was used for spraying. In the examples, the depth of saturation of mineral wool boards after spraying was 20mm. Gases containing formaldehyde and phenol (1.5 and 1.6 mg / m 3 , respectively) were passed through the filter at a rate of 300 mg / h. No phenol and formaldehyde were found in the passing gas.

Naudojant šį valymo būdą, išvengiama nutekamųjų vandenų susidarymo, kas supaprastina jo panaudojimą. Mineralinės vatos plokštes galima naudoti daug kartų užpurškiant vis naujas surišančių medžiagų porcijas. Tokiu būdu atpinga pats valymo būdas.This method of treatment prevents the formation of wastewater, which simplifies its use. Mineral wool boards can be used multiple times by spraying new portions of binders. In this way, the very way of cleaning is lost.

IŠRADIMO APIBRĖŽTISDEFINITION OF INVENTION

Claims (1)

IŠRADIMO APIBRĖŽTISDEFINITION OF INVENTION Išmetamųjų dujų nuo fenolio ir formaldehido valymo būdas, kai dujos paduodamos į indą, pripildytą vandenilio peroksidu su dvivalentės geležies druskų priedu bei karbamidu su amofosu santykiu 1:1, besiskiriantis tuo, kad išmetamąsias dujas praleidžia pro mineralinės vatos plokštes, supurkštas 20 - 50g 3%niu vandenilio peroksidu su 3% FeCl2 4H2O priedu ir 20%-niu karbamido su amofosu vandeniniu tirpalu.Method of purifying exhaust gas from phenol and formaldehyde by feeding gas into a vessel filled with hydrogen peroxide with a divalent iron salt additive and urea with amofos in a ratio of 1: 1, characterized in that the exhaust gas is passed through mineral wool panels, sprayed 20 - 50g 3% hydrogen peroxide with 3% FeCl 2 4H 2 O and 20% aqueous solution of urea with amophos.
LT96-024A 1996-03-05 1996-03-05 Method for purification of waste gas from phenol and formaldehyde LT4250B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5144898A (en) 1974-10-15 1976-04-16 Hochiki Co JIDOKEI HOSOCHI
SU867404A1 (en) 1977-08-31 1981-09-30 Предприятие П/Я А-1676 Method of cleaning waste gases from formaldehyde

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5144898A (en) 1974-10-15 1976-04-16 Hochiki Co JIDOKEI HOSOCHI
SU867404A1 (en) 1977-08-31 1981-09-30 Предприятие П/Я А-1676 Method of cleaning waste gases from formaldehyde

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