パラアルデヒド

Excerpt from ERG Guide 129 [Flammable Liquids (Water-Miscible / Noxious)]:

Use water spray, alcohol-resistant foam, dry powder, carbon dioxide. In case of fire: keep drums, etc., cool by spraying with water.

Fresh air, rest. Refer for medical attention.

Remove contaminated clothes. Rinse and then wash skin with water and soap.

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

Do NOT induce vomiting. Give one or two glasses of water to drink. Refer for medical attention .

· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.

· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.

EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

General First Aid:

Use water spray, dry chemical, "alcohol resistant" foam, or carbon dioxide. Water may be ineffective. Use water spray to keep fire exposed containers cool. Approach fire from upwind to avoid hazardous vapors and toxic decomposition products.

If material is on fire or involved in a fire: Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Solid streams of water may spread fire. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use "alcohol" foam, dry chemical or carbon dioxide.

PARALDEHYDE SHOULD BE STORED IN WELL-FILLED, TIGHT, LIGHT-RESISTANT GLASS CONTAINERS WITH A CAPACITY OF NO MORE THAN 30 ML, AT A TEMP NOT EXCEEDING 25 °C.

Store in a cool, dry, well ventilated location. Separate from alkalies, acids, iodides, oxidizing material, rubber, and plastic. Inside storage should be in a standard flammable liquids storage warehouse, room, or cabinet.

IT IS BEST STORED IN 2- OR 5-ML AMPULES, WHICH CAN BE OPENED FRESHLY & UNUSED CONTENTS DISCARDED.

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

A good candidate for liquid injection incineration at a temperature range of 650 to 1,600 °C and a residence time of 0.1 to 2 seconds. A good candidate for rotary kiln incineration at a temperature range of 820 to 1,600 °C and residence times of seconds for liquids and gases, and hours for solids. A good candidate for fluidized bed incineration at a temperature range of 450 to 980 °C and residence times of seconds for liquids and gases, and longer for solids.

Remove all ignition sources. Personal protection: filter respirator for organic gases and vapours adapted to the airborne concentration of the substance. Collect leaking and spilled liquid in sealable non-plastic containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations.

Animal studies indicate that disulfiram slows the metabolism of paraldehyde by way of inhibition of acetaldehyde dehydrogenase resulting in an increase in blood concn of paraldehyde & acetaldehyde. Until this potential interaction is investigated in humans, paraldehyde & disulfiram should be admin together with caution.

INTERACTIONS BETWEEN PARALDEHYDE & ETHYL ALCOHOL ARE NOT WELL UNDERSTOOD ... DOSES OF 1-2 OZ IN ALCOHOLICS SOMETIMES KILL WITHIN 0.5-4 HR. IN ANIMALS ETHANOL & PARALDEHYDE ARE SYNERGISTIC BUT LESS THAN ADDITIVE IN TERMS OF LETHALITY; UNDER SOME DOSAGE SCHEDULES, HOWEVER, EXPTL DATA SUGGEST THAT THESE DRUGS ARE ANTAGONISTIC.

ADDITIVE CNS DEPRESSION MAY OCCUR WHEN PARALDEHYDE IS ADMIN CONCOMITANTLY WITH OTHER CNS DEPRESSANTS SUCH AS BARBITURATES OR ALCOHOL. SOME FATALITIES HAVE BEEN ASSOCIATED WITH CONCOMITANT USE OF ALCOHOL & PARALDEHYDE.

The increased acetate levels which may follow paraldehyde administration reportedly may increase the danger of sulfonamide crystalluria.

For more Interactions (Complete) data for PARALDEHYDE (7 total), please visit the HSDB record page.

TERRESTRIAL FATE: If released to soil, paraldehyde may volatilize rapidly from soil surfaces or it may leach into deeper soil. Potential degradation products include acetaldehyde and acetic acid. (SRC)

AQUATIC FATE: If released to water, volatilization is expected to be an important, if not the dominant, fate process (half-life in a model river: 31 hr). Paraldehyde is not expected to bioaccumulate in aquatic organisms, or adsorb to suspended solids and sediments in water. (SRC)

ATMOSPHERIC FATE: Based on a vapor pressure of 25.5 mm Hg at 20 °C(1), paraldehyde is expected to exist almost entirely in the vapor phase in the atmosphere(2,SRC). Reaction with photochemically generated hydroxyl radicals is expected to be the dominant removal mechanism (half-life 45 hours). The relatively high water solubility of paraldehyde (125,000 mg/l at 25 °C(3)) suggests that this compound may also be removed from the atmosphere in precipitation(SRC).

Burning sensation. Cough. Shortness of breath. Further see Ingestion.

Redness. Pain.

Redness. Pain.

Burning sensation in the throat and chest. Nausea. Vomiting. Diarrhoea. Drowsiness. Unconsciousness.

Soil adsorption coefficients (Koc) of 7-55 were estimated for paraldehyde using linear regression equations based on a water solubility of 125,000 mg/l at 25 °C and a log Kow of 0.67(1,2,3,SRC). These Koc values suggest that paraldehyde would be very highly mobile in soil and that adsorption to suspended solids and sediments in water would be insignificant(4,SRC).

... IT MAY PRODUCE EXCITEMENT OR DELIRIUM IN PRESENCE OF PAIN. ... IN LARGE DOSES, IT PRODUCES RESPIRATORY DEPRESSION & HYPOTENSION.

SOME DELAY IN ONSET OF RESP MOVEMENTS HAS BEEN OBSERVED IN NEONATES FOLLOWING ITS ADMIN TO MOTHER DURING LABOR.

Patients poisoned by paraldehyde commonly exhibit very rapid, labored respiratory movements. Acidosis, bleeding gastritis, muscular irritability, azotemia, oliguria, albuminuria, leukocytosis, fatty changes in the liver and kidney with toxic hepatitis and nephrosis, pulmonary hemorrhages and edema, and dilatation of the right ventricle have all been observed in cases of severe acute or chronic paraldehyde poisoning.

Chronic paraldehyde intoxication results in tolerance and dependence. The paraldehyde addict may become acquainted with the drug when it is used in the treatment of alcoholism and then, surprisingly in view of its disagreeable taste and odor, prefer it to alcohol. Paraldehyde addiction resembles alcoholism, and sudden withdrawal may result in delirium tremens and vivid hallucinations.

For more Human Toxicity Excerpts (Complete) data for PARALDEHYDE (18 total), please visit the HSDB record page.

Paraldehyde may be released to the environment in emissions or effluents from sites of its manufacture or industrial use (paraldehyde is used as a drug, chemical intermediate, dyestuff intermediate, and solvent(1)) and from disposal of wastes containing this compound (ie hospital wastes)(2,3,SRC).

Based on a water solubility of 125,000 mg/l at 25 °C and a log Kow of 0.67, bioconcentration factors (BCF) of 0.8-2 were estimated for paraldehyde(1,2,3,SRC). These BCF values suggest that paraldehyde would not bioaccumulate significantly in aquatic organisms(SRC).

Paraldehyde is subject to control under the Federal Control Substance Act of 1970 as a schedule IV (C-IV) drug.

Paraldehyde is an indirect food additive for use as a component of adhesives.

Derivatives designated as a habit forming drug.

U182; As stipulated in 40 CFR 261.33, when paraldehyde, as a commercial chemical product or manufacturing chemical intermediate or an off-specification commercial chemical product or a manufacturing chemical intermediate, becomes a waste, it must be managed according to Federal and/or State hazardous waste regulations. Also defined as a hazardous waste is any residue, contaminated soil, water, or other debris resulting from the cleanup of a spill, into water or on dry land, of this waste. Generators of small quantities of this waste may qualify for partial exclusion from hazardous waste regulations (40 CFR 261.5).

This action promulgates standards of performance for equipment leaks of Volatile Organic Compounds (VOC) in the Synthetic Organic Chemical Manufacturing Industry (SOCMI). These standards implement Section 111 of the Clean Air Act and are based on the Administrator's determination that emissions from the SOCMI cause, or contribute significantly to, air pollution which may reasonably be anticipated to endanger public health or welfare. The intended effect of these standards is to require all newly constructed, modified, and reconstructed SOCMI process units to use the best demonstrated system of continuous emission reduction for equipment leaks of VOC, considering costs, non air quality health and environmental impact and energy requirements. Paraldehyde is produced, as an intermediate or final product, by process units covered under this subpart. These standards of performance become effective upon promulgation but apply to affected facilities for which construction or modification commenced after January 5, 1981.

Persons in charge of vessels or facilities are required to notify the National Response Center (NRC) immediately, when there is a release of this designated hazardous substance, in an amount equal to or greater than its reportable quantity of 1000 lb or 454 kg. The toll free number of the NRC is (800) 424-8802; In the Washington D.C. metropolitan area (202) 426-2675. The rule for determining when notification is required is stated in 40 CFR 302.4 (section IV. D.3.b).

Used as a substitute for acetaldehyde, an intermediate for dyes and other organic compounds, a solvent (fats, oils, waxes, gums, and resins), a rubber accelerator, and a medication (anticonvulsant and sedative); [HSDB] No longer prescribed as a medication; Was used as a motor fuel from 1939-1945; [Ullmann]

SUBSTITUTE FOR ACETALDEHYDE; MFR DYESTUFF INTERMEDIATES; SOLVENT FOR FATS, OILS, WAXES, GUMS, RESINS; LEATHER, MIXTURES FOR CELLULOSE DERIVATIVES

MFR ORGANIC COMPOUNDS

INDUSTRIALLY IT HAS BEEN USED AS SOLVENT & ALSO AS RUBBER ACTIVATOR & ANTIOXIDANT

Used in chemical synthesis as a source of acetaldehyde whereby resin formation and other secondary reactions are largely eliminated. ... for instance, ... production of pyridines and chlorination of chloral.

MEDICATION

PREPD BY POLYMERIZATION OF ACETALDEHYDE CATALYZED BY HCL & H2SO4 AT MEDIUM TO HIGH TEMP. CATALYZED BY MIXTURE OF H2SO4 & H3PO4.

BY TREATING ACETALDEHYDE WITH SMALL QUANTITIES OF SULFUR DIOXIDE, HYDROCHLORIC ACID, CARBONYL CHLORIDE, OR ZINC CHLORIDE; ALMOST COMPLETE CONVERSION OCCURS, & BY FREEZING LIQ & THEN DISTILLING CRYSTALLIZED MATERIAL, IF NECESSARY, PURE PARALDEHYDE IS PRODUCED.

Grade: Technical, USP.

Paraldehyde: Oral & Rectal (liquid) Paral (C-IV) from Forest.

Paraldehyde: Parenteral (Sterile) Paraldehyde injection (C-IV) from CMC.

The British Pharmacopeia specifies that it contains a suitable amount of an antioxidant; the USA Pharmacopeia permits a suitable stabilizer.

For more Formulations/Preparations (Complete) data for PARALDEHYDE (8 total), please visit the HSDB record page.

Fragrance Ingredients

Flavouring Agent -> FLAVOURING_AGENT -> JECFA Functional Classes

Environmental transformation -> Pesticide transformation products (metabolite, successor)

1,3,5-Trioxane, 2,4,6-trimethyl-: ACTIVE

/Paraldehyde is/ a cyclic polymer (trimer) of acetaldehyde.