Order Processing Time
All orders placed on our website are processed within 2-4 business days, from Monday to Friday, 8:00 AM – 6:00 PM Pacific Time (PT). Orders received after our daily cut-off time of 10:00 PM PT will be processed on the next business day. Please note that we do not process orders on weekends or public holidays.
Shipping Methods and Carriers
Zetlly partners exclusively with reputable shipping carriers to ensure timely delivery of your orders. We utilize:
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FedEx
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UPS
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USPS
The choice of carrier is determined by factors such as destination, weight, and delivery timeframe to provide optimal service.
Shipping Rates and Fees
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Free shipping is provided for all orders over $199.
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Orders under $199 will incur a flat-rate shipping fee of $7.99.
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All orders shipped within the United States will be subject to a sales tax charge of 5%.
Estimated Delivery Time
Once shipped, orders typically arrive within 6 to 10 business days. Our delivery times are from Monday to Friday, 8:00 AM – 6:00 PM Pacific Time (PT). Please allow additional time for deliveries to remote or rural locations.
Shipping Restrictions
Zetlly currently ships exclusively within the United States. At present, we do not offer international shipping or deliveries to P.O. boxes or APO/FPO addresses. Orders placed with addresses outside our designated delivery areas will be canceled, and refunds will be processed accordingly.
Tracking Your Order
Upon shipment, customers will receive a confirmation email containing tracking information. You can track your order directly through the provided tracking link or by visiting the carrier’s official website:
Please allow up to 48 hours for tracking information to update in the carrier’s system.
Eligibility for Returns and Exchanges
We accept returns and exchanges within 30 days from the date your order is delivered. Items must be unused, in the original condition, and accompanied by the original packaging and receipt or proof of purchase.
How to Return or Exchange an Item
To initiate a return or exchange, please follow these steps:
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Contact our customer support at [email protected] with your order number and reason for return or exchange.
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Our team will respond within 24 hours to provide detailed instructions, including the specific Return Address for your shipment.
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Package your item securely and include all original packaging and proof of purchase.
Return shipments should be sent to: Blanq LLC 1201 South Hope Street Apt 2413, Los Angeles, CA 90015, USA
Return Conditions
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Items must be returned in their original condition, unworn, undamaged, and complete with all original packaging and documentation.
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Items returned without prior authorization or not meeting the above conditions may not qualify for a refund or exchange.
Return Shipping Costs
Customers are responsible for return shipping costs unless the return is due to our error or a defective product. We recommend using a trackable shipping service to ensure your return reaches us safely.
Non-Returnable Items
The following items cannot be returned:
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Digital products (e-books or downloadable content)
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Personalized or customized items
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Gift cards
Accepted Payment Methods
Zetlly accepts the following secure and widely trusted payment options:
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PayPal: Easily pay through your PayPal account, benefiting from secure transactions and buyer protection.
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Stripe: Pay securely using major credit and debit cards including Visa, MasterCard, American Express, and Discover via Stripe’s encrypted payment gateway.
Payment Security
At Zetlly, your security is our utmost priority. We utilize advanced encryption technologies and robust security protocols provided by PayPal and Stripe. All payment information entered on our site is encrypted using Secure Socket Layer (SSL) technology, ensuring your financial information remains private and secure throughout the transaction process.
Zetlly does not store any credit card or sensitive financial information directly on our servers, further enhancing the security and protection of your personal data.
Payment Process and Confirmation
Upon placing an order, your chosen payment method (PayPal or Stripe) will immediately process the transaction. You will receive an automated confirmation email shortly after your payment has been successfully completed, detailing your transaction and order summary.
Please retain this confirmation email for your records and reference in case of any inquiries or disputes.
The #1 Guide to Chemical Engineering Principles, Techniques, Calculations, and Applications-Revised, Streamlined, and Modernized with New Examples Basic Principles and Calculations in Chemical Engineering, Ninth Edition, has been thoroughly revised, streamlined, and updated to reflect sweeping changes in the chemical engineering field.
This introductory guide addresses the full scope of contemporary chemical, petroleum, and environmental engineering applications and contains extensive new coverage and examples related to biotech, nanotech, green/environmental engineering, and process safety, with many new MATLAB and Python problems throughout. Authors David M. Himmelblau and James B. Riggs offer a strong foundation of skills and knowledge for successful study and practice, guiding students through formulating and solving material and energy balance problems, as well as describing gases, liquids, and vapors. Throughout, they introduce efficient, consistent, learner-friendly ways to solve problems, analyze data, and gain a conceptual, application-based understanding of modern processes. This edition condenses coverage from previous editions to serve today’s students and faculty more efficiently. In two entirely new chapters, the authors provide a comprehensive introduction to dynamic material and energy balances, as well as psychrometric charts. Modular chapters designed to support introductory courses of any length Introductions to unit conversions, basis selection, and process measurements Strategies for solving diverse material and energy balance problems, including material balances with chemical reaction and for multi-unit processes, and energy balances with reaction Clear introductions to key concepts ranging from stoichiometry to enthalpy Coverage of ideal/real gases, multi-phase equilibria, unsteady-state material, humidity (psychrometric) charts, and more Self-assessment questions to help readers identify areas they don’t fully understand Thought, discussion, and homework problems in every chapter New biotech, bioengineering, nanotechnology, green/environmental engineering, and process safety coverage Relevant new MATLAB and Python homework problems and projects Extensive tables, charts, and glossaries in each chapter Reference appendices presenting atomic weights and numbers, Pitzer Z^0/Z^1 factors, heats of formation and combustion, and more Easier than ever to use, this book is the definitive practical introduction for students, license candidates, practicing engineers, and scientists.Basic Principles and Calculations in Chemical Engineering 9th Edition is written by David M. Himmelblau; James B. Riggs and published by Pearson PTG. ISBNs for Basic Principles and Calculations in Chemical Engineering are 9780137327232, 0137327234 and the print ISBNs are 9780137327171, 013732717X.
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