Butyl cyclohexyl phthalate

304.38

304.38

201-548-5

BI70L704B7

69994

DTXSID5024689

Colorless liquid|Clear liquid

2917349000

52.6

5.3

Butyl cyclohexyl phthalate is a clear brown slightly viscous liquid with a very mild odor. (NTP, 1992)

1.076 g/cm³ @ Temp: 25 °C

<25 °C

189-222 °C @ Press: 5 Torr

184.4ºC

1.524

In water, 2.8X10-1 mg/L at 25 deg C (est)

4.77X10-6 mm Hg at 25 deg C (est)

Very mild odor

Henry's Law constant = 9.51X10-7 atm-cu m/mol at 25 °C (est)

Saponification number 369; acidity (as phthalic acid) 0.01% max|Phthalate esters would be expected to have UV maxima in the 230 nm and 270 nm regions. /Phthalate esters/|... Resistance to migration from polymers, low temperature flexibility ... compatibility with polar polymers and additives over a wide range of compositions. /Phthalate esters/|Hydroxyl radical reaction rate constant = 1.67X10-11 cu cm/molec-sec at 25 °C (est)

Insoluble in water. This compound will hydrolyze under high or low pH conditions. (NTP, 1992).

Esters, Sulfate Esters, Phosphate Esters, Thiophosphate Esters, and Borate Esters

An ester. Esters react with acids to liberate heat along with alcohols and acids. Strong oxidizing acids may cause a vigorous reaction that is sufficiently exothermic to ignite the reaction products. Heat is also generated by the interaction of esters with caustic solutions. Flammable hydrogen is generated by mixing esters with alkali metals and hydrides.

Stable. Hydrolyzes under low or high pH conditions. Incompatible with strong oxidizing agents.

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

USEPA; Ambient Water Quality Criteria Doc: Phthalate Esters (1980) EPA 440/5-80-067|Woodward KN (ed); Phthalate Esters: Toxicity and Metabolism (1988)|Phthalate Esters; Environ Health Perspect 45: 1-210 (1982)|USEPA/ECAO; Atlas Document for: Phthalate Esters (1980)

This chemical is probably combustible. (NTP, 1992)

Fires involving this compound should be controlled with a dry chemical, carbon dioxide or Halon extinguisher. (NTP, 1992)

SMALL SPILLS AND LEAKAGE: If you spill this chemical, use absorbent paper to pick up all liquid spill material. Your contaminated clothing and absorbent paper should be sealed in a vapor-tight plastic bag for eventual disposal. Solvent wash all contaminated surfaces with alcohol followed by washing with a strong soap and water solution. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned. STORAGE PRECAUTIONS: You should store this material in a refrigerator. (NTP, 1992)

RECOMMENDED RESPIRATOR: Where the neat test chemical is weighed and diluted, wear a NIOSH-approved half face respirator equipped with an organic vapor/acid gas cartridge (specific for organic vapors, HCl, acid gas and SO2) with a dust/mist filter. (NTP, 1992)

Combustible.

SRP: Contaminated protective clothing should be segregated in such a manner so that there is no direct personal contact by personnel who handle, dispose, or clean the clothing. Quality assurance to ascertain the completeness of the cleaning procedures should be implemented before the decontaminated protective clothing is returned for reuse by the workers. Contaminated clothing should not be taken home at end of shift, but should remain at employee's place of work for cleaning.

Butyl cyclohexyl phthalate's production and use as a plasticizer(1) may result in its release to the environment through various waste streams(SRC).

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 5,100(SRC), determined from a structure estimation method(2), indicates that butyl cyclohexyl phthalate is expected to be immobile in soil(SRC). Volatilization of butyl cyclohexyl phthalate from moist soil surfaces is not expected to be an important fate process(SRC) given an estimated Henry's Law constant of 9.5X10-7 atm-cu m/mole(SRC), using a fragment constant estimation method(3). Butyl cyclohexyl phthalate is not expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 4.77X10-6 mm Hg(4). Biodegradation data for butyl cyclohexyl phthalate were not available(SRC, 2008). However, by analogy to dicyclohexylphthalate which reached 68.5% of its theoretical BOD in the Japanese MITI test(5), butylcyclohexyl phthalate may be subject to biodegradation in the environment(SRC).|AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 5100(SRC), determined from a structure estimation method(2), indicates that butyl cyclohexyl phthalate is expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is not expected(3) based upon an estimated Henry's Law constant of 9.5X10-7 atm-cu m/mole(SRC), developed using a fragment constant estimation method(4). According to a classification scheme(5), an estimated BCF of 2900(SRC), from an estimated log Kow of 5.41(6) and a regression-derived equation(7), suggests the potential for bioconcentration in aquatic organisms is high(SRC). However, bioconcentration studies on compounds which are structurally similar suggest that bioconcentration may be lower than that indicated by the regression-derived equations due to the ability of aquatic organisms to readily metabolize this class of compounds(8). Hydrolysis is not expected to be an important process(SRC) based on estimated hydrolysis half-lives of 5.3 years and 190 days at pHs 7 and 8, respectively(9). Biodegradation data for butyl cyclohexyl phthalate were not available(SRC, 2008). However, by analogy to dicyclohexylphthalate which reached 68.5% of its theoretical BOD in the Japanese MITI test(10), butylcyclohexyl phthalate may be subject to biodegradation in the environment(SRC).|ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), butyl cyclohexyl phthalate, which has a vapor pressure of 4.77X10-6 mm Hg at 25deg C(2), will exist in both the vapor and particulate phases in the ambient atmosphere. Vapor-phase butyl cyclohexyl phthalate is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 23 hours(SRC), calculated from its rate constant of 1.7X10-11 cu cm/molecule-sec at 25 °C(SRC) that was derived using a structure estimation method(3). Particulate-phase butyl cyclohexyl phthalate may be removed from the air by wet or dry deposition(SRC). Butyl cyclohexyl phthalate does contain chromophores that absorb at wavelengths >290 nm(4) and therefore may be susceptible to direct photolysis by sunlight(SRC).

The rate constant for the vapor-phase reaction of butyl cyclohexyl phthalate with photochemically-produced hydroxyl radicals has been estimated as 1.7X10-11 cu cm/molecule-sec at 25 °C(SRC) using a structure estimation method(1). This corresponds to an atmospheric half-life of about 23 hours at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1). A base-catalyzed second-order hydrolysis rate constant of 4.1X10-2 L/mole-sec(SRC) was estimated using a structure estimation method(2); this corresponds to half-lives of 5.3 years and 190 days at pH values of 7 and 8, respectively(2). Butyl cyclohexyl phthalate does contain chromophores that absorb at wavelengths >290 nm(3) and therefore may be susceptible to direct photolysis by sunlight(SRC).

An estimated BCF of 2,900 was calculated in fish for butyl cyclohexyl phthalate(SRC), using an estimated log Kow of 5.41(1) and a regression-derived equation(2). According to a classification scheme(3), this BCF suggests the potential for bioconcentration in aquatic organisms is high(SRC). However, bioconcentration studies on compounds which are structurally similar suggest that bioconcentration may be lower than that indicated by the regression-derived equations due to the ability of aquatic organisms to readily metabolize this class of compounds(4).

Using a structure estimation method based on molecular connectivity indices(1), the Koc of butyl cyclohexyl phthalate can be estimated to be 5,100(SRC). According to a classification scheme(2), this estimated Koc value suggests that butyl cyclohexyl phthalate is expected to be immobile in soil.

The Henry's Law constant for butyl cyclohexyl phthalate is estimated as 9.5X10-7 atm-cu m/mole(SRC) using a fragment constant estimation method(1). This Henry's Law constant indicates that butyl cyclohexyl phthalate is expected to be essentially nonvolatile from water surfaces(2). Butyl cyclohexyl phthalate is not expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 4.77X10-6 mm Hg(3).

NIOSH (NOES Survey 1981-1983) has statistically estimated that 1548 workers (20 of these were female) were potentially exposed to butyl cyclohexyl phthalate in the US(1). Occupational exposure to butyl cyclcohexyl phthalate may occur through inhalation and dermal contact with this compound at workplaces where butyl cyclohexyl phthalate is produced or used(SRC). Use data indicate that the general population may be exposed to butyl cyclohexyl phthalate via inhalation of particulates and dermal contact with products containing butyl cyclohexyl phthalate(SRC).

SYMPTOMS: Symptoms of exposure to this compound may include irritation of the eyes, nose and mucous membranes. ACUTE/CHRONIC HAZARDS: This compound may cause skin irritation on contact. (NTP, 1992)

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. SKIN: IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. If symptoms such as redness or irritation develop, IMMEDIATELY call a physician and be prepared to transport the victim to a hospital for treatment. INHALATION: IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used; if not available, use a level of protection greater than or equal to that advised under Protective Clothing. INGESTION: DO NOT INDUCE VOMITING. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. Be prepared to transport the victim to a hospital if advised by a physician. If the victim is convulsing or unconscious, do not give anything by mouth, ensure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. IMMEDIATELY transport the victim to a hospital. (NTP, 1992)

1,2-Benzenedicarboxylic acid, 1-butyl 2-cyclohexyl ester: ACTIVE|The first step, alcoholysis of phthalic anhydride (PA) to give the monoester, is rapid and goes to completion. The reaction generally starts at elevated temperatures and proceeds exothermically. The second step is the conversion of the monoester to a diester with the formation of water. This is a reversible reaction and proceeds more slowly than the first, thus determining the overall rate of reaction. To shift the equilibrium towards the diester, the water of reaction is removed by distillation. The rate of reaction can be influenced by the choice of catalyst and the reaction temperature. For fast conversion rates, high reaction temperatures are generally used. However, these are influenced by the boiling point of the alcohol and/or the type of catalyst. ... Currently, nearly all major phthalate producers use amphoteric catalysts for the esterification of high boiling alcohols. ... The reaction temperatures for the amphoteric catalysts are about 200 °C. At this temperature side reactions are minimized, and the alcohol can be recycled without purification. By using this type of catalyst, over 99.5 % conversion to diester can be achieved. /Phthalates/